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.


We believe that sustainability shouldn’t compromise on aesthetics or functionality. This is why our smart and powerful windows remain as transparent and durable as any others.

At PHYSEE we cherish our diverse and inclusive company culture. With currently 8 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.

We are always looking for the next PHYSEEonair to enrich our knowledge, determination, and ability to do so.

If you are as inspired as we are on shaping 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!”.



Bart Kroes

Project Manager

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.



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.


David de Vries

Sputtering Graduate

David is an ambitious individual that is driven by connecting his complex scientific thesis research to PHYSEE’s next-generation PowerWindow with a consistent smile and an upbeat spirit. His analytical skillset, ability to keep a clear overview of his project, and resilience to tackle unforeseen problems makes him a great member for the PHYSEE research team.



Douwe van der Stroom

Business Development Intern

Nickelodeon child voice actor turned sailing, suits and sales enthusiast. Douwe brings passion and enthusiasm to internal and external PHYSEE meetings, with a continuous ambition to build his skillset and learn from those around him. Keep calm and sail on.



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.



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.



Heidi Mao

UX/UI Front-End 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.


Jan David Endtz

Polymer Graduate

Jan David has led the Research team to explore uncharted areas and unfamiliar topics. His work in PHYSEE has always opened up new opportunities and new insights. He shows unswayable perseverance and hunger for knowledge, and he pursues and tackles problems with great diligence and motivation. He is truly a man who refused to accept defeat.



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.



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.



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.



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 Buskermolen

Business Graduate

Pim is the brains behind our beloved PHYSEEbility Check, enabling PHYSEE to analyse buildings for sun exposure and solar radiation. With concentration, calculations and humour, he adds great value to our deals regarding buildings solar potential. Other than that, Pim is our king of communication on slack, the best bolognese cook and the next Roger Federer of PHYSEE.



Pim Rutgers

Head of Soft- & Hardware

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 Projects, Head of Design & Engineering, founding team

Inside PHYSEE, there’s a tale of the two-headed Sam. As co-founder, he resides in PHYSEE leading two departments; Project, and Design & Engineering. 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.. He created and now oversees the bridge from design & engineering to project development, allowing PHYSEE to excel in all areas.



Sander Blom

Optics Modelling Intern

Kickstarting his professional career, Sander is charging with PHYSEE into a future of sustainable modelling. Being both methodical and perseverant, he programs the next-generation model of our windows. While he plays the fullback on a football field, he is certainly the forward on the PHYSEE field, bringing knowledge and enthusiasm to a whole new level.



Sjoerd Fröberg

Business Development Intern

Not your average business and finance student. From exploring new cities on the weekends to executing tactical market research and business models for PHYSEE, Sjoerd is planning the roadtrip to success for this company. Soon enough, his travel guide for PHYSEE business development will be ready to use.



Sven Aarssen

Product Engineering Intern

Learn by doing. This motto drives Sven from his mechanical engineering studies to his adventurous weekly mountain biking to his hands-on experience here with us. On board with the projects team, Sven is quickly adapting to the fast pace of execution, by working on assembling windows and 3D modelling prototypes, all with a smile on his face. The only thing missing for Sven here at PHYSEE are winter sports and Austrian food.


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.