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.


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!



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 Hardware 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!



Barth de Klerk

Senior Business Developer

As our latest addition to the commercial team, Barth, brings an extensive track record in both general management and business consultancy to PHYSEE’s scaling up. Other than spending time with family and enjoying the outdoors, Barth has worked at small and large companies all around the world and focuses on ethical business. He’s a man with a purpose: make the world a better place to live in. We’re excited to be part of his new adventure!



Camilla Massacesi

Lead Innovation 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.



Cansel Temiz

Chemical Engineer

One could say she is the treasurer of PHYSEE’s positivity and energy. Always looking for the upside or the solution, Cansel is what you need in a fundamental research team, as she works well with the unpredictable outcomes it entails. Being a curious individual, she is also focusing on the “curiosity topics” within the Coatings team, identifying where our research could lead to an undiscovered impact in the future. We’re excited to have a new nationality (Turkey) in the team and to see what more she will bring to our growth!



Emily Paulus

Financial Controller

Described as fun, caring and a go-getter, Emily has some hidden gems next to being the financial controller of PHYSEE (which is already a gem to us)! Aside from handling complex excel spreadsheets all day, she releases a different kind of creativity on the football pitch and the dancefloor! Coming from a big family with lots of girl-power, we’re excited to continue experiencing the power she brings to our growth from within the finance department…



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

Head of HR

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.



Giulio Simone

R&D Engineer

As our second Italian PHYSEEonair, we are pleased that Giulio brings with him the Italian extrovert personality and a passion for pasta. He is a sputter engineer at PHYSEE and is on a mission to optimize the performance of luminescent coatings. This is the first step in his personal vision, which is working on novel technologies that mitigate climate change. We’re happy to have his energy in the room and are excited to see the positive impact he will continue to make.



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!



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.



Joe Kao

Lead 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.



Joep Wolfhagen

Legal Counsel and Business Developer

Joep is heading up our partnerships and legal matters. Prior to joining us in Delft, he worked as a lawyer at the international firm Freshfields Bruckhaus Deringer in Brussel, Paris and Amsterdam. He thrives at starting new partnerships so that our products can become globally accessible! Other than in the office, you might find Joep on his race bike, something he likes to do in his free time. 



Joris de Iongh

Brand Manager

He’s a new addition to the Marketing & Branding team, but a recognizable face around the office. Joris has worked externally with PHYSEE since 2015 as a branding consultant before he joined us internally. He has been part of building the PHYSEE brand since the early stages and plays a crucial role in maintaining the flow of our story, image and identity. Coming from a technical background in Delft together with his entrepreneurial endeavors, we’re excited to see what he transforms our brand into next!



Joseph Hesketh

Production 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!



Juan Alonso Pla

Comfort Engineer Intern

Determined to make an impact and deeply knowledgeable about the field of sensor control, Juan brings an interesting skill set to the Power team. He is known for his enthusiasm and “quick but clear” speaking and is working on bringing our machine learning to the next level through testing predictive models. We’re excited to see where his work brings SmartSkin!



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!



Lawrence Liu

Growing up in Taiwan and The United States, Lawrence brings resilience and a creative perspective to the R&D team. He has a passion for solar and amongst other things, works on how we transport energy through the grid of a building. Outside of work he focuses on getting even better at squash, something he picked up and couldn’t let go of at university, or biking through new cities in The Netherlands!


Liesanne Wieleman

Junior Project Engineer

As a self-made entrepreneur outside of work, and a Junior Project Manager at PHYSEE, Liesanne is an adaptable and sharp character, who doesn’t let stress ruin her fun at managing it all. With her determination and resilience, she fits in perfectly with the adventures of the Projects department, responsible for seamless installations of our products.



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!



Luis Romero

Power Electronics Engineer

Always looking for the next activity filled with adrenaline, Luis really sees “the world as his oyster” and radiates his positivity to those around him. He’s passionate about building solutions and the world of green energy, which is why we are thrilled to have him on board our crazy ship as a Power Electronics Engineer. If you’re ever looking for Luis, you can’t miss him on Monday’s at 17:30 at our weekly PHYSEEo bootcamp!



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.



Manon Duijn

Product Engineer

Although Manon comes from The Netherlands, she has an appetite for Mediterranean cuisine and often spends her free time working on new recipes (next big challenge: baking sourdough bread!). At PHYSEE, she will be focusing on designing and engineering our products such as the EESYbox. When she can’t be reached at the office, Manon is probably enjoying nature, where she likes to recharge her energy!



Neerav Dubal

Embedded Software Engineer

Neerav is the Embedded Software guru, working on our firmware from within R&D. He is a natural creative, who loves to build his own projects and solve complex problems. This is the mindset he brings to work and doesn’t shy away from a challenge, which mirrors how he treats his motorcycle, continuously fixing and maintaining it for a better output. You know where to find him if you need to fix something!



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

PA to CEO and CFO

Continuous growth is a trait that lies within Noortje’s DNA. Due to her warmhearted and approachable character in combination with her unique history at PHYSEE, she has evolved to be the Mother Teresa you want by your side- which the founding duo of PHYSEE spotted early on. Her grit, dedication, and organizational skills have allowed her to take up the challenge of being exactly that for our CEO and CFO’s: their Personal Assistant. As the right hand of PHYSEE’s two captains, we’re excited to see where she steers them next!



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.



Rahul Grover

Smart Facade Engineer

As another “external-turned-internal” PHYSEEonair, we’re proud to have Rahul as an official member of the team, after working as our external PHYSEEbility Check Engineer. He brings an impressive skill set of engineering and has taken on the challenge of working on our solar and comfort study, analyzing building data and making our impact tangible for clients. Adaptability and motivation are why Rahul stands out, and we’re happy to see where he takes the PHYSEEbility Check in the future!



Rene van den Bulk

Project Engineer

Rene, or also known as “woodleg” (ask him to find out why), is in our Projects department and an expert in building-engineering of utility-construction in facades. He is described as a loyal, family-focused go-getter who loves nature, and aims to persevere after any setbacks in his way. He likes to say everything has a reason, which must also be why he has chosen to be a PHYSEEonair, and vice-versa!



Sadiq van Overbeek

Lead Research Engineer & Product Owner of PAR+

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

COO 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..



Shane Yao

Fullstack Software Engineer

Adaptable, curious and ready for new challenges, Shane brings multiple perspectives to PHYSEE. He’s lived in countless cities (even Las Vegas!) and is always ready to dive into a new comfort zone. This time, moving all the way from New York! With a passion for movies and how they are made, Shane is full of surprises and is excited to take our Fullstack developing to the next level, where he will be bridging the world of data and ready-to-use information.



Solco Reijnders

Project Manager

Solco is building on his degrees in mechanical- and offshore engineering to streamline the realization of every project going through our pipeline. With a rich history in improvisation theater, he is capable of tackling every unforeseen hurdle every project inevitably has in store.



Stijn van den Berg

Junior Project Manager

Daring and limitless, Stijn has a passion for peanut butter, philosophy, outdoor adventure and building technology. Described as a “technical creative” by his peers, Stijn is on the Projects department as Junior Project Manager and will be helping PHYSEE seamlessly install our smart technology into buildings with the highest quality. PS: he can be your travel-guide to South Africa, Nepal, Mexico, and many more places…



Wai-Man Tang

Quality Assurance Manager

He’s quick, he’s organized, he’s who you want as your Quality Assurance Manager. Lucky us! But there’s more to Wai-Man than quality assurance… he is also a team-player who is always ready to help out when he’s not enjoying his morning coffee (or working on his hidden talent of interior design). Long story short, he’s a triple threat! We’re lucky to have him watching over our shoulders when it comes to the quality of our work because, at the end of the day, one of our core values will remain #passionforexcellence.



Willem Kesteloo

Co-founder, CFO and interim CTO

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.



Willem-Jan Otten

Operations Manager

He’s on a bigger mission than most. Willem-Jan, our Operations Manager, is working towards achieving a full, self-sustaining eco-farm outside of work. This co-exists with his role at PHYSEE, as he is hands-on and managing the production of our SmartSkin products from inside the production facility: the PHYSEE PHactory. Always ready to laugh and cook, Willem-Jan is a unique addition to our team, widening everyone’s perspective on living sustainably as well as having a good time doing it.