About Us

At PHYSEE, we believe in people. Without a determined and enthusiastic team of PHYSEEonairs, our mission would just be a dream. Together, we are unleashing the full potential of clean building facades.

Our Vision

We envision a future of energy neutral buildings where user’s comfort and productivity levels are increased. Therefore, we are balancing out the energy demand by producing and consuming electricity locally, providing tomorrow’s buildings with the SmartSkin they deserve.

At PHYSEE, we cherish our diverse and inclusive company culture. With currently 10 different nationalities onboard, we value every added perspective as we feel it is our responsibility to change the world’s perspective of a sustainable future.

If you are as inspired as we are on changing tomorrow’s buildings, join us on our mission. We are stronger together!

Meet our team


Ana Jung

Head of Research

From living in the world of chemistry, Ana is taking over a physicist mission with her charm and thirst for excellence. She leads the Research department and works with external partners ranging from research to production to validation. It is a rarity to encounter Ana without the company of her smile. As some would say “happy wife, happy life”, here in PHYSEE we always believe in “happy Ana, happy life!”.



Arjen Jellema

Embedded Engineer

He is the mastermind behind the SMART sensor on our SmartWindows, adding a vital component to our products and to our team! From speed cycling to cooking and gardening, Arjen is always up for an adventurous challenge and is making his mark by bringing creative thinking to the Development team each day. As one of our latest talent additions, we are thrilled to have in the PHamily and are excited to see where he will take the SmartWindow!



Bart Kroes

Head of Projects

Earning his stripes as a Sr. Engineer at an oil company, Bart recently made the moral pivot into the renewable industry. PHYSEE is very proud to have acquired this talent and will benefit greatly from his experience. Like a drone in the sky, Bart will oversee all projects and the processes on quality and efficiency. He is determined to reinvent the way the industry operates and make PHYSEE a renowned player in the game.



Camilla Massacesi

Solar Engineer

About half of the incoming solar energy reaches the Earth’s surface, yet we are lacking tools to fully functionalise it. Camilla believes in increasing those tools. Much like the solar panels that we use to collect sunlight, she helps PHYSEE access all the potential solar energy and convert our product into a fully functional one. Behind this capable solar engineer, hides the (arguably even better) cook who brings true Italian love to PHYSEE.



Caspar Boers

Sputtering Graduate

Mind over matter. Caspar is not only helping our research team reach new levels of greenhouse coatings, but he is also training for a marathon. It takes a strong and devoted mindset to carry out both activities, which he is doing simultaneously. Caspar is described as curious, driven and passionate. We are excited to see what his 9 months will add to changing the perspective!




Cathleen Schepers

Posphor Graduate

Always bringing a smile to work, Cathleen also brings chemistry into the lives of PHYSEE’s phosphor synthesis. Choosing tea over coffee is a lifestyle for her, as well as travelling around in order to savor the blend of different spices and lives. Much like so, she brought chemistry into the physicist’s perspective of synthesis, adding the flavor of endless possibilities.


Chao Hsu

Research Intern

Pioneering the field of chemical modification, Chao’s contributions to PHYSEE’s technology cannot be understated. With Chao’s rich history in tutoring all levels of students in physics, chemistry, thermal dynamics and molecular transport alongside numerous pristine educational achievements he has always truly strived for excellence. When he’s not on the court scoring 3-pointers, Chao’s in the lab identifying new chemical formulas to make sure our PowerWindows change the perspective. His result-driven personality allows him to conquer every challenge with impeccable speed and precision. He’s a true member of the PHamily and we look forward his next big accomplishments.


Grace Copplestone

Supply Chain Manager

She completes the production team at PHYSEE with her positive energy, constant curiosity and the skill to challenge those around her. Like the mountains she conquers on her bike, she sees every challenge as a milestone to overcome, allowing the winding journey to be daring and eventful. There ain’t no mountain high enough!



Drim Stokhuijzen

Design Engineer

Two things never bore Designer Drim: sketching a car and optimizing the design of products or content for PHYSEE. He pursues a perfectionist mentality and continues to shape the PHYSEE culture tremendously. He is the wave that PHYSEE surfs forward on, re-shaping our product and content design and continuously making sure a PHYSEE product remains the best product.



Douwe Muller

Sputtering Graduate

For 9 months, he will be tapping into the opportunities of luminescent coatings for greenhouse glass in our research department. From working in the lab to skiing the mountains or playing his piano, Douwe follows his curiosity and lets it feed him new ideas and solutions. We are happy to have him on board with such a unique project!



Elise Groen

Business Analyst Intern

A business analyst with a niche for unimaginable kindness, Elise looks to the future with PHYSEE and helps the team define potential paths to prosperity. Elise’s critical thinking skills allow her to recognise the essence of future opportunities and milestones long before anyone else can. This makes her the best of the best in educating her peers and colleagues. In her free time, she loves playing guitar and taking long walks through the scenic dutch fields. Her hard work and perseverance propels her forward, only looking back to see if she can take anyone with her. With Elise on our side, PHYSEE will always be well-equipped to rise to the challenges of tomorrow!


Ferdinand Grapperhaus

Co-founder and CEO

Joking aside, Ferdinand always motivates and leads the PHYSEEonairs with his charisma and insightful guidance. As a co-founder of PHYSEE, he possesses leadership qualities that inspires everyone in- and outside the office. Ferdinand did not only bring professionalism and structured execution to PHYSEE, he also played a vital role in creating a family at work.



Fréderique Pars

HR Advisor

Every team needs the glue that sticks them together. Fréderique is just that, she leads the HR activities with compassion and enthusiasm for our combined success and personal growth. She challenges and motivates us to be the best PHYSEEonaires we can, and knows who we need next, to help achieve the future we envision.



Heidi Mao

Fullstack Developer

Bringing back-end solutions to life, with a PHYSEE PHace. By designing and building the EESYapp for our users, Heidi develops insights in customer interaction with our product. Her methodical yet creative design mindset allows her to see beneath the surface of data and create a meaningful user experience. Her interest in people interaction continues to make her an engineer who doesn’t only help develop software, but also the skills of those around her.



Herco Zwijnen

Financial Controller

From an academic past in science to a career in finance, it is time for the king of striped suits to combine his two passions at PHYSEE! Not only does he bring his (national level) speedminton expertise to the company, but also structure and financial planning on our path towards success. He believes in a sustainable future for the world, and plans on achieving it with an open mind, hard work and lots of Italian food.


Joe Kao

Research Engineer

With an constant refreshing perspective from material research in the lab to strategic and creative brainstorming at events, to scoring 3-pointers on the court, his broad skillset coexists with a unique drive, making him the triple threat we are proud to have on our team. His analytic mind and honesty already lead PHYSEE to inventive solutions and have no limit. Taiwanese food is his favorite and basketball his game.



Koen Haest

Product Engineer

From shredding the mountains on a snowboard to shredding creativity for product innovation at PHYSEE, Koen has a versatile and robust skillset. Accessorised with diverse thoughts and direct action, he is a valuable asset to our team in many ways. Having him on board as our new product engineer, we are more than excited to see where his contribution takes our future SmartSkin!



Maarten De Haas

Head of Business

Just like a party needs a good DJ to get the party started, PHYSEE needs a driven and knowledgeable enthusiast to convey the vision and mission of our existence. With a big smile on his face, Maarten leads his business team, making the impossible possible. Much like our SmartWindow, Maarten makes PHYSEE work smart and powerful, with increased comfort levels.



Maarten Ingen Housz

Sales Developer

The voice of an angel” is just one of Maarten’s many traits. He describes himself as an outdoor man, always seeking the next adventure, regardless if it’s music, sports or languages. The Business team is thrilled to have another person on board increasing our impact, working on continuous growth within the European real estate industry. (If you need a Swedish translation, he’s your guy!)



Maike Schwarz


Already as an intern, Maike brought to the office a great passion for the position of a marketeer. Her presence always lights up the surroundings and motivates those around her. She tackles issues head-front with strong determination and a big smile. Next to her impressive taste for marketing is her everlasting energy and enthusiasm.



Nico Pulskens

Sales Developer

As a seasoned sailor in the window industry, Nico brought with him his experience and expertise to help PHYSEE grow into an internationally recognized company. Never is Nico short of his smile and passion for people, doing much more for PHYSEE than sales. With his entrepreneur mindset and established skillset, Nico is showing the real estate industry a new sea to sail.



Nitish Kumar Sinha

Projects Intern

Nitish is here to reinforce the Projects department and challenge anyone to a go-karting race! Nitish likes to use his technical expertise and knowledge of computer simulation technologies to test the performance, durability, and functionality of engineering solutions in a virtual environment. Nitish fills up his spare time by playing football, traveling, experimenting cuisines and hanging out with his friends. Throughout his professional life he has not only had great fun and success with participating in teams, he has also worked hard enough to see himself become the leader. The wide spectrum of skills and characteristics make Nitish a valuable colleague and friend of the whole PHYSEE team.



Noortje Jonkman

Head of Office

Many say that a messy desk is a messy mind. Behind the organised desk of Noortje sits the organised mind of PHYSEE. As PHYSEEonairs work to innovate with sustainability, Noortje is always one step ahead, keeping the company on track with enthusiasm. She keeps the office full of smiles, structure and spirit. Oh and she makes sure we all eat enough fruits, which is pretty cool.



Pim Rutgers

Head of Development

Much like a magician, Pim changes how the world views windows. From POWER to SMART, Pim changed the windows of PHYSEE and the role they will play in the future of real estate. He leads the department that combines power and data, bringing us one step closer to the future of facades. Pim puts magic into the programs and devices that talk to our clients, always ensuring the best experience a user can have.



Rens Ottens

Project Engineer

Implementing our technology for a vast variety of building facades, while aiming for a standardised solution requires an innovative approach. As an architect specialised in Building Technologies, and with experience in facade engineering, Rens strives to design the facades of the future. His versatile skillset and enthusiasm classify him as our jack of all trades, engineering projects in the digital world and executing them on the construction site.



Sadiq van Overbeek

Research Engineer

Among all the PHYSEEonairs, here comes the wisest of them all. While some people see it in his elegance, some see it in his experience as he once opened a company of his own, refereed in international sporting events, and drove a sturdy vintage car. His wisdom also helps him usher in many sputtering research achievements that are praised by the industry.



Sam Anders

Head of Production and part of the founding team

Inside PHYSEE, there’s a tale of the two-headed Sam. As part of the founding team, he has lead two departments to scaled-up success: Project, and Design & Engineering. Now he remains Head of Production and will convert a 3000sqm warehouse into a high-tech manufacturing facility with his team. The tale also tells that he delivers top-notch products to all of our clients, and even once to an ex-president of the U.S..



Sebastiaan Visser

Sales and Marketing Intern

Sporty, tall, curious, caring and motivated are the descriptions best suiting Sebastiaan! Fresh out of his exchange semester in South Korea, he is always up for experiencing something out of his comfort zone, and inspired by those around him. Other than taking our PHYSEEbility Check to the next level, Sebastiaan is helping out our Marketing game and sales conversions. 6 months seems too short, but we’re excited to make the most out of the collaboration!



Subhitcha Ramkumar

Development Intern

With The Netherlands being the first on her list of visits outside of India, Subhitcha is taking the Dutch by storm! Starting with an internship at Dow Chemicals, followed by a Master’s in electrical power engineering, she has gained extraordinary expertise in the field of Maximum Power Point Tracking.  When she’s not singing her beloved Hindi songs or binge-watching Friends for the 36th time, Subhitcha is perfecting our PV modules to harness and process as much energy as possible. PHYSEE is very much looking forward to learning from Subhitcha, not only as a professional but also as an individual.



Willem Kesteloo

Co-founder and CFO

Behind every PHYSEEonair is the inspiring Willem. As a man of iron and a co-founder of PHYSEE, he constantly motivates PHYSEEonairs to achieve their highest potential. Other than his positive mindset, Willem is also a practitioner and the embodiment of ‘Kill mediocrity”. When anyone thinks of the future of PHYSEE, it’s Willem in the forefront leading the change with determination and guidance.



Joseph Hesketh

Product Engineer

The PHamily’s latest addition as the Product Engineer goes by the name of Joseph. Joseph’s warm and seamlessly calm state of mind is what you see but his ferocious drive and perseverance for perfection underneath the surface is what you get. The combination of this personality makes him an amazingly enjoyable person whilst still pioneering the field of Production engineering. Joseph is fantastically rising to the challenge of mass-production and maintaining the ever-growing list of stakeholder relationships. We’re happy to have welcomed yet another Brit to our team!



Lisette van der Knaap

Office Manager

We have had the pleasure of welcoming Lisette to the PHamily! Lisette will be strengthening the PHYSEE team with her incredible versatility. Her rich history of coordinating people, teams, and programs has enabled her to become highly accessible, develop stellar organizational skills, and always gain meaningful relationships will her peers. We look forward to seeing how she will add her spark to the office!



Jelmer Kort

We are proud to present the newest addition to our development team; Jelmer! Being witty and sincere, we are looking forward to seeing his mind going to work in order to optimize the conjunction of the glass and the power modules of our SmartSkin technology! Even with a small exchange of words, it is noticeable that Jelmer lives to motivate and be motivated. This is why he always gets out a smile, waves a fresh ‘hello’ and has an intriguing conversation topic in his back pocket. Aspire to inspire is something Jelmer takes to heart beautifully.