The people that make HES
HES takes care of having the right people in the right place. We believe each and every team member has to perfectly fit in the team and in their role. They are the organization and bring the right mindset to the table.
"First the who and then the what."
Management Team
Ivan van Winsen
Managing Director
Ivan has nearly 10 years of experience in the offshore sector. Graduated from Delft University of Technology with a master's degree in ship hydrodynamics he started his career with Heerema Marine Contractors as marine engineer. He has worked on several commercial and innovation projects worldwide, as well as leading the Heerema Simulation Center.
He loves technical challenges and working with a group of enthusiastic people that all bring their individual expertise to the table, resulting in the best possible solutions! Over the last years he led the internal development of the Motion Compensated Gripper Frame and led the development team within HES. As per August 1st he has been appointed as Managing Director.
In his free time he loves sailing with his wife and two sons, reading and cooking.
Henk Smienk
Engineering Manager
Outside the office he spends his time with his girlfriend, three boys and one little girl, and likes to be outdoors, skiing and running long distances as he finds it relaxing.
Silvan Slijpen
Commercial Manager
Alessio Pistidda
Sr. Specialist Marine Engineer
Andres Yepez Calderon
Structural Engineer
Arjen Franken
Specialist Structural Engineer
Arthaud Adriaenssens
FEM Engineer
Casper van Lynden
Marine Engineer
Daan Koetzier
Engineer
Dennis Dane
Software Engineer
In his spare time he likes to develop his website, 3d-printing, Arduino projects, skiing and water sports.
Dimitrios Tsiropoulos
Specialist Engineer
Eelco van Vliet
Specialist Engineer
Elisa Romero Pascual
Product Lead Floating Wind
After finishing her Civil Engineering MSc, Elisa joined HMC as a Marine Engineer, where she worked for several Installation and Decommissioning projects for 5 years. During her last year at HMC she worked at the Simulation Centre, where she could be part of innovative and out of the box offshore projects. After that she joined a maritime simulation software company where she lead the product team.
At HES, Elisa is working on floating wind, leading the technical developments and looking for commercial opportunities.
In her free time, she likes to cycle, practice yoga, read and spend time with family and friends.
Ellemijn Rog
Sr. Installation Engineer
Ellemijn started at HES with 5 years of experience in the offshore renewable industry. With a master’s degree in marine engineering, she has developed a wide perspective on the offshore wind market in the last years. She has experience as an installation and cost engineer, an integral role in multidisciplinary and international teams. She enjoys to participate in the newest developments of the offshore wind market. Within HES, Ellemijn uses her experience to strengthen the fixed and floating wind developments. In her spare time Ellemijn enjoys to play field hockey, running, cycling and hiking.
Ethan Nigel
Marine Engineer
He enjoys problem solving and working at the forefront of engineering technology. In his free time, Ethan likes to go to the gym, running, and meeting up with friends.
Farkas Beothy
Marine Engineer
Farkas did his BSc in Mechanical Engineering in Hungary, then came to the Netherlands for his Masters. After graduating cum laude from his MSc Marine Technology in Delft, Farkas started Heerema Engineering Solutions. In his work, he tackles problems in both abstract and practical ways to gain in-depth insight into the subject and find feasible solutions to the problem. His main focus at HES is doing marine engineering tasks within the floating wind development team. In addition, he also participates in projects that involve CFD, motion analysis, and internal development works.
In his free time Farkas plays Ultimate Frisbee at a high level. He likes cooking, go on bike rides, and recently picked up Kitesurfing.
Gino Parisella
Sr. Marine Engineer
Giulia Rossi
Marine Engineer
Harald Ottens
Technical Project Manager
Harald has an MSc in aerospace engineering and a BSc in economics and business. He finds joy in biking, running, and spending time with his family.
Ian Mullens
Engineer
Jelle ter Braak
Specialist Engineer
Jelle’s journey in the offshore industry started by finishing his MSc Offshore Engineering at the TU Delft. After working in the structural department at HMC where he co-developed a purpose built Finite Element Package he moved to HES. For three years Jelle has worked with several clients and has been involved in multiple interesting innovation projects related to the XL monopile installation market. The projects include but are not limited to subsea monopile templates and motion compensated gripper frames where he is working on hydrodynamic, control and simulation topics.
In his free time Jelle enjoys food, reading, making music and photography.
Jim Zwartveld
Specialist Engineer
Joep van der Spek
Marine Engineer
Joep joined HES as a working student in 2019 and stayed for almost 2 years while pursuing his MSc degree in Marine Technology, specializing in Ship & Offshore Structures. He worked on smart solutions for wind installation and automation of hydrodynamic analysis.
He graduated on the initial load assessment of semi-submersible floating offshore wind turbines under wind/wave misalignment with a major turbine supplier. After his graduation, he returned to HES to strengthen the floating wind development team. Among other topics, he focusses on floating wind developments for internal and external projects.
In his free time, he enjoys backpacking and can be found around Delft road cycling or playing basketball.
Joost Zoutendijk
Installation Engineer
Karin Leijs
Offshore Engineer
Kathryn McPherson
Software Engineer
With 12 years of engineering experience in the oil and gas industry, Kathryn has experience in every phase of a project, from concept studies to design, interface engineering, integration testing, offshore installation analysis, pre-commissioning, and decommissioning. Her main area of expertise is the design and installation of subsea pipelines. She also has a background in mathematics and a master's degree in space science. In 2023, Kathryn joined HES and has been working on the Metis logistics tool. She approaches challenges systematically, ensuring technical accuracy, and enjoys working in a team. In her spare time, she likes to spend time with her family, go running and cycling, and occasionally take part in triathlons.
Katrien de Jong
Master Thesis Student
Lisa van Calsteren
Office Manager
Lizette Dittmar - van Halewijn
Sr. Administrator
Lucas Delfos
Working Student Engineer
Lucas is a Master’s student in Offshore and Dredging Engineering at TU Delft, where he builds on a solid foundation of Mechanical Engineering. Joining Heerema Engineering Solutions in 2024 as a Working Student Engineer, Lucas is passionate about solving engineering challenges from both practical and theoretical perspectives. His keen interest in offshore wind energy and the energy transition aligns with his dedication to finding innovative, sustainable solutions. Outside work and study, Lucas enjoys playing the piano and guitar, performing with his band, and spending time with friends and family.
Mark Hoorn
Structural Engineer
In addition to his work, Mark enjoys cooking, baking, and hiking in his free time. Cooking allows him to unwind and express his creativity in the kitchen, while baking allows him to experiment with new techniques and flavors.
Nicolas Moscoso
Geotechnical Engineer
In his free time, he loves playing squash, kitesurfing and walking his dog.
Patrick Symes
Installation Engineer
Quint van Suijlen
Installation Engineer
Riding his motorcycle, sailing, football, DIY and spending time with his friends and family keep him busy during non-business hours.
Reinier van Rossum
Technical Authority Wind Installation
Robert Weegenaar
Sr. Installation Engineer
Sam de Bode
Installation Engineer
Sanjeet Desai
Automation Engineer
After finishing his BSc in Mechanical Engineering in India, Sanjeet came to the Netherlands to pursue an MSc in Aerospace Engineering. After graduation, he joined a simulation software company where he worked with numerical models for ship performance and hydrodynamics. He also helped with the development of a digital twin platform and CFD simulations.
Within HES, he is a part of the data engineering and automation team and will be helping with the development and preparation of Metis simulations.
In his free time, he enjoys cooking, photography, rowing, hiking, and occasionally mountain climbing.
Sarah Killoh
Tender Coordinator
Sarah joined the Heerema Group in 2019, working for Heerema Marine Contractors in Sustainability and Communication roles. After deciding that it was time to try something new, Sarah moved to HES in 2023 and joined the Commercial team.
Her responsibilities include business development activities, tender management, proposal writing, client relationship management, and marketing and communication.
When Sarah's out of the office, she is spending time with her family, enjoying the outdoors, and working on various crafty projects that keep her busy.
Thijs van Essen
Marine Engineer
Thom Haafkes
Marine Engineer
Thomas Balder
Development Lead
Tieme Moens
Engineer
In his work, Tieme enjoys a balance of modelling, programming, and designing. He also values an open, friendly and passionate workplace, which means he’s in the right place at HES. In his free time, Tieme can often be found at concerts and festivals, or at home reading.
Toon van der Linden
Geotechnical Engineer
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