WaterProof B.V. was founded in 2015 and is based at the Flevo Marina Trade Centre in Lelystad. In addition to our office with a view over the water, we have a workshop, research facilities and our boats there.
We focus on both consultancy and service provision. With a strong combination of theoretical knowledge and practical understanding of systems, we offer high-quality, solution-oriented products to our customers worldwide.
We have a passionate and motivated team with a wide range of expertise. We are proud that, by bringing together all our individual knowledge, we are able to turn even the most challenging and innovative projects into real successes.
Quality, safety and sustainability are central to the way we work. With our ISO 9001, 14001 and 45001 certification, we demonstrate that we meet international standards in the areas of quality, the environment and safety.
Our staff are trained to work safely at sea. All our surveyors hold BOSIET/HUET certification and have passed a medical examination. Where necessary, we provide our staff with additional training in accordance with GWO standards, for example for working at height and accessing wind turbines or offshore platforms.
Together, we continue to build on the foundations of WaterProof B.V.: curious, independent, innovative and always mindful of the impact our work has on the world around us.
Would you like to find out more? Take a look at our services, meet our team or get in touch!
Roelant started WaterProof together with Luitze in October 2015. With his inexhaustible energy, passion and enthusiasm he built our great company over the past 10 years, with a special focus on research into underwater acoustics and its impact on marine life. Roelant has been a huge inspiration for innovative research at sea.
Roelant’s vision and dedication have not only laid the foundation for the growth of our company, but also for the way we approach our studies. His drive to push boundaries and discover new knowledge has inspired us all to look beyond the obvious and understand the deeper impact of our work on the environment. We will miss his unmistakable presence, his passion and his ability to motivate others.
His legacy will always remain an integral part of WaterProof.
Technical Officer
Outside of our own personnel, we also collaborate extensively with our partners.
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Director of Business Development and Innovation
Luitze Perk is Director of Business Development and Innovation and co-founder of WaterProof, which he established together with Roelant Snoek. He is a hydraulic engineer and graduated from Delft University of Technology (TU Delft) with a specialisation in Coastal Engineering.
Luitze has extensive experience in hydrodynamic and morphodynamic studies. Over the past years, he has been involved in the development, calibration, and validation of numerical models for studies in coastal areas and estuaries across the world. Throughout his career, he has contributed to numerous port and coastal development projects, assessing the effects of engineering interventions on currents, waves, salinity and salt intrusion, density-driven flows, and morphological processes, including sedimentation and erosion.
As both a specialist and team leader of the numerical modelling team within the Rivers, Coasts and Seas department at ARCADIS, Luitze gained extensive expertise in assessing the impacts of interventions in coastal systems. Building on this experience, he now provides strategic advice on coastal engineering projects in his role as Coastal Projects Advisor. More recently, he has developed significant experience in managing multidisciplinary projects that integrate a wide range of water-related disciplines.
Director of Marine Acoustics
Joost works at WaterProof as Director of Marine Acoustics. He has more than ten years of experience in marine research. Since joining WaterProof in 2018, he has specialised in the effects of underwater sound on marine mammals, working on acoustic projects around the world for a wide range of clients. He now leads WaterProof’s marine acoustics team, guiding a group of specialists in underwater sound and marine mammal monitoring, modelling, research and impact assessment.
Joost leads several large research projects on the impact of offshore wind development on cetacean populations in the North Sea. This work helps build the scientific evidence needed to make sure the energy transition is possible without undue harm to the North Sea ecology.
He leads and carries out Environmental Impact Assessment (EIA) contributions on anthropogenic sound, including sound from foundation installation (pile driving), vessels, underwater explosions such as UXO clearance, and seismic surveys.
Joost also advises on underwater sound and marine mammal impact for offshore wind projects, working with contractors and with the Dutch government. In this role he connects scientific research, regulation and day-to-day offshore operations, translating complex acoustic findings into clear, workable advice for developers and policymakers.
Throughout his career, Joost has published his research findings in several scientific publications.
Managing Director
Marieke Snoek is the Managing Director and co-owner of WaterProof.
Her connection to WaterProof is both personal and professional. Her brother, Roelant, founded WaterProof together with Luitze Perk in 2015. Through his energy, curiosity, and entrepreneurial spirit, he built WaterProof into a specialised consultancy for the marine sector, with a strong focus on underwater noise and its impact on marine life. His drive to push boundaries and develop new knowledge continues to inspire the organisation.
When Roelant was diagnosed with a terminal illness, he asked Marieke to continue building WaterProof together with Luitze. She accepted without hesitation.
Marieke’s background is in entrepreneurship. As Managing Director of Cycloon (2012–2024), a social and sustainable postal and bicycle courier company, she led the organisation through a period of growth from 40 to more than 1,200 employees across 40 locations. During those years, she discovered the importance of giving people the space to develop their talents, building a strong organisational culture, and bringing people together around a shared ambition. She believes that everyone has unique talents and that good leadership begins with creating opportunities for people to realise their full potential.
She brings this experience to her role as Managing Director of WaterProof, where she focuses on strengthening the organisation and creating the conditions for the company’s specialists to apply their expertise to its fullest potential for clients. Together, they continue to build on the foundation laid by Roelant and Luitze: driven by curiosity, independence, innovation, and a constant awareness of the impact of their work on the world around them.
Director of Coast & Sea
Nathanaël Geleynse works at WaterProof as Director of Coast & Sea. He is a physical geographer with many years of experience in offshore, coastal, and inland water system projects. After completing his degree in Physical Geography, he obtained his PhD at Delft University of Technology (TU Delft), where his research focused on the development of river deltas. He subsequently worked as a postdoctoral researcher at the National Center for Earth-Surface Dynamics in the United States, where he contributed to the development of techniques for coastline detection using bathymetric data and satellite imagery.
Throughout his career, Nathanaël has provided technical expertise to a wide range of projects, from the development of hydrodynamic models for the design and assessment of primary flood defences to expert advice on expected dredging requirements for port development projects. More recently, he has contributed to studies supporting the development of the Dutch flood defence assessment framework (WBI/BOI) and to the design of the (New) Afsluitdijk.
Nathanaël values close collaboration with clients, research institutes, and project partners to develop the best solutions for complex water-related challenges. He has worked as a technical advisor with Wetterskip Fryslân on the first assessment of the sandy flood defence on Schiermonnikoog. Drawing on his scientific background, he actively collaborates with the research community to translate the latest scientific insights into engineering practice and to promote knowledge sharing.
At WaterProof, Nathanaël works at the intersection of field measurements, numerical modelling, and laboratory experiments. His work focuses on studies involving hydrodynamics, the transport of substances such as salt, sediment, and oil, and morphological processes.
Specialist
Koen van der Laan works at WaterProof as a Coastal & Marine Specialist. In 2017, he completed his Master’s degree in Marine Sciences at Utrecht University. For his MSc thesis, conducted at the Faculty of Geosciences and the Institute for Marine and Atmospheric Research Utrecht (IMAU), he investigated the influence of changes in ocean circulation on sea surface temperatures in the Gulf of Guinea during the Pliocene and Miocene. During a research internship at NIOZ, he analysed the spatial and temporal variability of the volume, heat, and freshwater transport of the Irminger Current using observational and reanalysis data. This research formed part of the Overturning in the Subpolar North Atlantic Program (OSNAP), which aims to determine the strength and variability of the Atlantic Meridional Overturning Circulation (AMOC).
At WaterProof, Koen specialises in the numerical modelling and analysis of hydrodynamic and morphodynamic processes in coastal environments.
Specialist
Ruben van der Neut works at WaterProof as a Coastal & Marine Specialist. In September 2017, he completed his Master’s degree in Applied Marine Science at the University of Plymouth, specialising in coastal erosion and protection, and remote sensing.
For his MSc thesis, conducted in collaboration with the Plymouth Coastal Observatory, Ruben investigated the origin and the spatial and temporal variation of fine sand deposits along the south-east coast of England.
At WaterProof, Ruben is involved in the analysis and numerical modelling of morphodynamic processes, electromagnetic fields surrounding offshore power cables, and supports a range of research and development (R&D) projects.
Specialist
Kamiel Röell works at WaterProof as a Coastal & Marine Specialist. In October 2022, he completed his Master’s degree in Earth Surface and Water at Utrecht University, specialising in the hydrodynamics and morphodynamics of coastal systems. Both his research internship and MSc thesis were carried out at Deltares. During his internship, he worked on mapping hydrodynamic conditions in various benthic habitats as part of the Kustgenese 2.0 pilot nourishment project near the Ameland Inlet. His MSc thesis focused on large-scale changes in and exchanges of sediment volumes on the deep shoreface along the Dutch coast.
At WaterProof, Kamiel is involved in the development of numerical models and the analysis of model results and field measurement data related to hydrodynamic and morphodynamic processes.
Specialist
Meike Traas works at WaterProof as a Specialist. In September 2022, she completed her Master’s degree in Earth Surface and Water at Utrecht University, specialising in Coastal and River Dynamics. For her MSc thesis at the Faculty of Geosciences, she investigated the influence of river discharge on estuarine morphology and salinity. Using a numerical model, she assessed these processes to make predictions on a global scale. During her internship at WaterProof, she carried out a data analysis to evaluate the potential of an echosounder for measuring sediment concentrations under different conditions.
At WaterProof, Meike is involved in data processing, as well as the numerical modelling and analysis of hydrodynamic and morphodynamic processes in coastal environments.
Specialist
Rinse de Swart works at WaterProof as a Coastal & Marine Specialist. He studied Physical Geography at Utrecht University, specialising in coasts and estuaries. For his MSc thesis, he used Delft3D to model salt intrusion and tidal propagation in estuaries.
After graduating, Rinse worked at WaterProof for one year before spending five years as a PhD researcher and postdoctoral researcher at the Universitat Politècnica de Catalunya in Barcelona. There, he investigated the dynamics and interactions between sandbanks and the coastline, earning his PhD cum laude in July 2022. Since returning to WaterProof in November 2022, Rinse has been involved in hydromorphological studies in coastal environments, applying his scientific expertise to a wide range of projects.
Throughout his career, Rinse has published his research findings in scientific publications.
Specialist
Ruurd Jaarsma works at WaterProof as a Coastal & Marine Specialist. In 2023, he completed his Master’s degree in Hydraulic Engineering at Delft University of Technology (TU Delft), where he specialised in coastal engineering and field measurements. During his graduation project, he validated an improved method for measuring sediment concentrations using ADCPs. He subsequently gained further experience at a developer of these instruments, where he built an extensive national and international network in a commercial role.
At WaterProof, Ruurd focuses on solving coastal engineering challenges through field measurement projects in the coastal zone, ranging from small-scale to large-scale projects, both in the Netherlands and internationally. He applies his extensive knowledge of monitoring equipment, together with his expertise in data engineering and data analysis using Python, to collect, process, and interpret reliable measurement data.
Specialist
Bas Boekhorst works at WaterProof as a Hydromorphology Specialist. In 2021, he completed his Bachelor’s degree in Civil Engineering at Avans University of Applied Sciences in Tilburg. He subsequently obtained his Master’s degree in Hydraulic Engineering at Delft University of Technology (TU Delft), specialising in coasts and estuaries, which he completed in 2025.
During his studies, Bas gained practical experience at several hydraulic engineering consultancies and contractors. He completed internships at Boskalis in Singapore and at Haskoning, where he worked as a project assistant before and during his pre-Master’s and Master’s studies. For his Bachelor’s thesis at Arcadis, he designed temporary wave-breaking structures to create safe and workable wave conditions for loading and unloading work vessels at a jetty near Teignmouth on the south coast of England.
For his Master’s thesis at WaterProof, Bas investigated the interaction between waves, tidal currents, wind, and water levels near the Prins Hendrik Sand Dyke on Texel. Using field measurements, he validated a hydrodynamic Delft3D-SWAN model, enabling him to determine during which tidal phases waves from the North Sea reach this sheltered coastal area and how local wind conditions and tidal currents influence this process.
At WaterProof, Bas works within the combination of field measurements, numerical modelling, and laboratory experiments. He specialises in the modelling and analysis of hydrodynamic and morphodynamic processes in coastal and estuarine environments. In addition, he is involved in physical scale model tests and in the collection, processing, and interpretation of field measurement data.
Technical Specialist
Geert Jan Deenen works at WaterProof as a Technical Specialist. He completed his education in Precision Mechanical Engineering in 1998 and obtained his diploma as an Instrument Maker at the V.U. in Amsterdam in 2000. After completing his education, he gained 24 years of experience as a CNC instrument maker. With more than 27 years of experience in metal and plastic processing, Geert Jan has developed broad technical knowledge and practical expertise across a wide range of production and manufacturing disciplines. His experience includes CNC machining (turning, milling and wire EDM), welding, and various conventional machining techniques.
Within WaterProof, Geert Jan contributes to various projects involving design, fabrication and modification. With his technical expertise and practical approach, he contributes to the construction and realization of custom monitoring setups, as well as the assembly of measurement systems and research frames. In addition, he is involved in the maintenance and support of the vessel fleet, including the execution and certification of NEN 3140 electrical safety inspections.
Technical Specialist
Gerrit Vosselman works at WaterProof as a Technical Specialist. In this role, he is responsible for the management and maintenance of the company’s vehicles and vessels and serves as one of its captains. He also regularly participates in offshore fieldwork.
Gerrit completed his degree in Mechanical Engineering at the Higher Technical School (HTS) in Zwolle. After graduating, he started his own business. As an importer, distributor, and member of the manufacturer’s R&D teams, he specialised in two- and four-stroke engines, contributing primarily to product development and the delivery of dealer training programmes. He later worked as a project engineer and project manager in renewable energy, where he was responsible for commercial solar energy projects.
At WaterProof, Gerrit combines his broad technical expertise with his strong affinity for working on and around the water.
Specialist
Andres F. Casas Reyes works at WaterProof as a Specialist. He completed his Master’s degree in Environmental Sciences, specialising in Environmental Quality, at Wageningen University & Research in 2025. His academic focus was on North Sea ecology in relation to offshore infrastructure. For his MSc thesis, he investigated the food web characteristics of the epibenthic fouling community on an offshore gas production platform.
In light of the increasing construction of offshore wind farms, the aim of his research was to gain insight into how fouling communities on vertical structures, such as offshore wind turbines and production platforms, may develop over multiple decades. During his studies, he participated in a wide range of fieldwork activities with institutes including the Alfred Wegener Institute, NIOZ, Wageningen Marine Research, and the Saba Conservation Foundation.
At WaterProof, Andres applies this knowledge and experience to the planning and execution of fieldwork, as well as the preparation and deployment of monitoring equipment and research instruments at marine construction sites and existing offshore infrastructure, including offshore wind farms.
Specialist
Frans van Helvert works at WaterProof as a Specialist. He has a background in renewable energy technologies, circularity, and offshore environmental monitoring, with a particular focus on offshore wind farms. In 2023, he obtained his Master’s degree in Industrial Ecology from the Faculty of Science at Leiden University, where he studied the life cycle impacts of innovative offshore renewable energy technologies.
After graduating, Frans became involved in offshore projects from a practical perspective, initially working as a maintenance technician and deckhand aboard small support vessels, and later as an environmental field technician. Since then, he has contributed to and led various offshore monitoring campaigns in collaboration with research institutes such as Wageningen Marine Research (WMR) and NIOZ, focusing on the cumulative environmental effects of offshore wind farms on primary production in the North Sea.
Technisch medewerker
Steven Klijnsma works at WaterProof as a Technical Officer. He is a practical, flexible, and versatile team member with a broad background in areas including hospitality, theatre, and software development. He also gained experience building and maintaining bicycles, where he discovered that his strengths and interests lie primarily in practical and technical work.
At WaterProof, Steven is involved in a wide range of projects and supports various activities. With his practical mindset and solution-oriented approach, he contributes to the smooth execution of projects. Steven is also our in-house handyman, ensuring that technical and practical matters around the office are properly maintained and resolved.
Specialist
Pepijn van Tol works at WaterProof as a Coastal & Marine Specialist. He completed his Bachelor’s degree in Ocean Technology (Hydrography) at the Willem Barentsz Maritime Institute (MIWB) on Terschelling. He subsequently obtained his Master’s degree in Geoscience and Remote Sensing at Delft University of Technology (TU Delft). During his studies, he gained extensive knowledge of geospatial data acquisition, processing, and modelling. For his Master’s thesis, he investigated the impact of GNSS correction data spoofing.
Specialist
Lynn ten Napel works at WaterProof as a Specialist. In August 2022, she completed her Master’s degree in Physics and Astronomy at Radboud University Nijmegen, specialising in solid-state physics. At WaterProof, Lynn applies her background in physics and scientific approach to the analysis of underwater acoustic data. Her work includes source noise prediction, sound propagation modelling, and the development of filters for the analysis of acoustic data.
Specialist
Irna Huisjes works at WaterProof as a Specialist. She completed her degree in Coastal and Marine Management at Van Hall Larenstein University of Applied Sciences in Leeuwarden. During several internships and holiday placements, she gained experience at SEAMARCO (Sea Mammal Research Company), where she contributed to research on the effects of underwater noise on harbour porpoises, seals, and sea lions. In addition, she contributed to research on differences in whistle patterns among bottlenose dolphin populations in various countries as part of both a project internship and her graduation research.
At WaterProof, Irna is involved in a variety of underwater acoustics projects, with a particular focus on the role of marine mammals within these studies.
Specialist
Simon Beelen works at WaterProof as a Marine Acoustics Specialist. In 2018, he completed his Master’s degree in Mechanical Engineering at the University of Twente. For his Master’s thesis, he investigated the scale effects of cavitation on ship propellers.
After graduating, he worked as a consultant in building physics and acoustics before pursuing a PhD at the University of Twente, where he conducted research on bubble curtains. During his research, he carried out extensive hydrodynamic and acoustic measurements and analysed the collected data. Completing his PhD in May 2024 required extensive data processing, analysis, and presentation. In addition, he developed and applied numerical models to improve the understanding of his measurement results.
Throughout his career, Simon has published his research findings in several scientific publications.
Specialist
Yakamoz Kizildas works at WaterProof as a Marine Mammal Specialist within the Underwater Acoustics team. She is a marine biologist with a background in marine mammal population genetics and bioinformatics. During and after her Master’s degree at the University of Groningen, she conducted research on various cetacean species, for which she spent several field seasons in Iceland.
Yakamoz has extensive experience with coastal and offshore fieldwork campaigns in several countries, both as a participant and in a leading role. At WaterProof, she is involved in various research and development projects, including studies on the impact of underwater noise on marine mammals and the development of mitigation measures. She is also trained as a PAM operator and regularly participates in offshore fieldwork for projects involving underwater noise and marine mammal monitoring. In these projects, she applies her background in marine research and her expertise in marine mammals.
Specialist
Joost works at WaterProof as a Marine Acoustics Specialist. In 2025, he completed his Master’s degree in Biology at Wageningen University & Research, specialising in Marine Ecology. During his studies, he gained broad experience across a range of research fields, including tropical coral ecology, marine acoustics, marine mammal research, and data science.
For his MSc thesis, Joost investigated the influence of spatial and temporal variation, as well as the presence of offshore wind farms, on the distribution of harbour porpoises and pelagic fish species in the Dutch North Sea. In addition, he completed a research internship in a coral laboratory, where he worked on selecting thermally tolerant coral larvae to improve the resilience of coral reefs to climate change.
At WaterProof, Joost is involved in the analysis of acoustic detection data from harbour porpoises, the preparation and management of monitoring equipment and instrumentation, and the execution of offshore fieldwork. With his background in marine ecology, acoustics, and data analysis, he contributes to the collection and interpretation of high-quality monitoring data for marine projects.
Specialist
Timothy Chan works at WaterProof as a Specialist in the Underwater Acoustics department. His work focuses on the modelling and measurement of underwater noise. In addition to underwater acoustics, his research experience spans multiphase turbulence, millifluidics, and fluid-structure interactions. The results of these studies have been published in multiple articles in renowned scientific journals.
Prior to joining WaterProof, Timothy was a researcher at the University of Twente. In 2025, he obtained his PhD in Applied Physics from the University of Twente, specialising in fluid physics. He previously earned his MSc in Applied Physics, graduating cum laude from the same university, and his BSc in Physics (First Class Honours) from the Chinese University of Hong Kong.
QHSE Manager
Marijke Olivierse has been working at WaterProof as QHSE Manager and Project Officer since 2016. In 2009, she completed her degree in Coastal and Marine Management at Van Hall Larenstein University of Applied Sciences.
As QHSE Manager, Marijke developed and implemented WaterProof’s Quality and Environmental Management System. The company has been certified to ISO 9001:2015 and ISO 14001 since 2017, with the environmental certification updated to ISO 14001:2026 in 2026. In addition, WaterProof has held ISO 45001 certification for Occupational Health and Safety Management since 2020, with the certification updated to ISO 45001:2023 in 2024. Marijke is responsible for all aspects related to the safe execution of offshore measurement campaigns and ensures that projects are carried out in accordance with the company’s Safety Plan.
As part of WaterProof’s national and international projects, Marijke is involved in developing safety procedures, GIS activities, environmental and planning management, and supporting offshore fieldwork.
HR & Office Manager
Chelsea van den Heuvel works at WaterProof as HR & Office Manager. After completing her degree in Communication and Multimedia Design at the Amsterdam University of Applied Sciences, she gained experience in various roles at a digital and creative agency. During this time, she also completed a management traineeship, where she developed a strong foundation in entrepreneurship, leadership, and management.
At WaterProof, Chelsea applies this knowledge and experience to a wide range of business support and management support activities. In addition, she is responsible for various administrative tasks and supports the QHSE Manager in maintaining the company’s ISO Quality, Environmental, and Occupational Health & Safety Management System.
Financial Administrator & Office Manager
Marjolein IJzerman works at WaterProof as Financial Administrator & Office Manager. She completed her studies in Social Work and Services at Windesheim University of Applied Sciences and Business Administration at Landstede in Zwolle. During and after her studies in Business Administration, she gained experience at several organisations in financial administration, combined with a variety of office management responsibilities.
At WaterProof, Marjolein applies this knowledge and experience to a wide range of financial and administrative activities. In addition, she carries out various business support and management support tasks and assists the QHSE Manager.
Project Coordinator
Merel Entius works at WaterProof as a Project Coordinator. After completing her Bachelor’s degree in Creative Business, she gained experience in communication, project support, and marketing. Through various roles, she developed strong skills in planning and coordinating activities, monitoring schedules and deadlines, and supporting a wide range of projects.
At WaterProof, Merel supports project managers in the preparation, organisation, and coordination of projects. In addition, she contributes to the company’s marketing and communication activities. With her structured approach, attention to detail, and proactive attitude, she helps ensure efficient collaboration and the smooth execution of projects.
