Our Team
Ewit Roos Partner & Co-founder
Ewit Roos Partner & Co-founder
Before joining PhotonVentures as a General Partner, Ewit Roos co-founded PhotonDelta, which under his leadership as CEO, became a globally recognized, well-funded accelerator of the integrated photonics industry, focused on scaling the supply of photonic integrated circuits (PICs) and their applications. He orchestrated an extensive ecosystem involving Netherlands-based universities, research labs, over 60 company partnerships, and investors, culminating in €1.1 billion of committed investments from the Dutch government and corporate partners for the next five years.
Throughout the years, PhotonDelta has been instrumental in founding and funding over ten deep-tech photonics startups, within the broader semiconductor industry. In 2023, PhotonVentures, initially a private investment arm within PhotonDelta, spun off as an independent entity, continuing the venture capital activities incubated by PhotonDelta. Ewit's strategic and impactful contributions in venture capital and corporate partnership development have notably advanced the Dutch integrated photonics sector, particularly through the establishment as co-founder of the dedicated PhotonVentures VC fund.
Ewit also made significant strides as Director at Brightmove BV, where he navigated early-stage equity funding for high-tech startups, leading to the funding of 45 companies, predominantly in Series-A rounds. His academic background, a management degree from Nyenrode Business University and an MPA from Erasmus University Rotterdam, complements his professional acumen.
Rijkman Groenink Partner & Co-founder
Rijkman Groenink Partner & Co-founder
Rijkman Groenink, having an educational background in Law and Business Administration, transitioned from a distinguished banking career—peaking as CEO at ABN AMRO—into various impactful entrepreneurial and investment pursuits. His endeavors include co-founding a Private Equity fund focused on renewable energy projects and initiating a thriving coffee farming and roasting operation in Ethiopia.
With substantial experience managing multifaceted organizations and Private Equity businesses, and a period as the chairman of the equity investment committee, Rijkman has developed proficiency in startup management, directorship, and advisory roles. His understanding of business operations and corporate governance is both deeply rooted and expansive.
Through his principal involvement with PhotonVentures, Rijkman aims to significantly contribute to the success of the company, advocating for the swift adoption of integrated photonics benefits by industries and the global economy alike. His vision extends beyond the immediate success of co-founded ventures, aspiring to tightly weave influential technologies into our economic frameworks.
Pieter Klinkert Partner & Co-founder
Pieter Klinkert Partner & Co-founder
Pieter Klinkert, with expertise in Law and Economics, has distinguished himself by steering Venture Capital-backed companies towards eminent success, specializing in management and business development.
In 2019, Pieter embraced a key role as a Senior Fund Manager for OostNL before transitioning to PhotonDelta in 2021, where he adeptly applied his expansive experience in devising actionable strategies for several portfolio companies. His professional journey is shaped not only by his roles but also by a profound interest in breakthrough technologies, particularly those emerging from R&D institutes and academic spin-offs.
Pieter embodies a hands-on approach in his involvement with companies, focusing on management, business development, and future funding rounds to ensure not just growth but also sustainable development in the ventures with which he collaborates.
Joachim de Sterke Partner & Co-founder
Joachim de Sterke Partner & Co-founder
Before pioneering PhotonVentures, Joachim de Sterke co-founded PhotonDelta, where he played a crucial role in expediting the development of the Dutch and EU integrated photonics markets. His impactful contributions include meticulously constructing a robust ecosystem and investment portfolio, and strategically cultivating individual partnerships and a global network to bolster the industry's growth.
With a rich entrepreneurial history, Joachim brings not only in-depth sector and investment knowledge but also a proven track record of building. He founded two internationally backed SaaS companies and established the Creative Capital Studio fund, reflecting his entrepreneurial and innovative mindset and multifaceted expertise in navigating and nurturing ventures from inception to success.
Joachim’s academic background is rooted in an MSc of Finance from the Erasmus University Rotterdam.
Linde Lassche Senior Fund Manager
Linde Lassche Senior Fund Manager
Before joining the team, Linde Lassche developed thorough investment experience during her ~10 years as an Investment Professional at FMO, the Dutch Development Bank. She worked on early-stage and scale-up companies, structured finance, and PE/VC fund investments, covering many different sectors. Over the past 5 years, Linde was instrumental in shaping the VC Program’s set-up and strategy, managing assets, and spearheading investments primarily in the Cleantech domain. Furthermore, Linde's experience with VC and PE fund investments gives her a holistic perspective on the success drivers of fund management.
Linde’s academic background is rooted in an MSc in Economics. Additionally, Linde has also honed her coaching and leadership skills through a 3-year program from Phoenix Education.
Now at PhotonVentures, Linde's unique combination of global investment expertise, leadership skills, and fund management insights make her a valuable asset in further developing and scaling PhotonVentures.
Jacqueline Tange Office Manager
Jacqueline Tange Office Manager
Jacqueline Tange brings a dynamic, hands-on approach to managing office operations at
PhotonVentures. With many years of professional experience, she has overseen
sustainability projects, marketed international trade exhibitions, served as executive
secretary on various boards, and managed private investor programs at a financial training
firm. Her extensive background demonstrates versatility and a depth of expertise. Her
Bachelor's degree in Business Administration, with a focus on marketing, solidifies her
extensive practical experience.
As the Office Manager for PhotonVentures, Jacqueline is the linking pin that keeps the
office, marketing, and communication operations running seamlessly. Renowned for her
clear communication, swift decision-making, and her integral role in aligning the company's
daily activities with its strategic goals, she fosters a productive environment where the team
can thrive.
Flo Pattiwael Senior Investment Associate
Flo Pattiwael Investment Associate
Prior to joining our team, Flo Pattiwael gained valuable experience as an investment
trainee at PGGM Investment Management. During his tenure, he held various roles
encompassing investments, strategy, and ESG. At PGGM, his recent contributions
included involvement in energy transition investments and the implementation of a
new impact investing strategy.
In addition to his professional commitments, Flo also serves as a board member of
the United Nations Global Compact - Young SDG Network and co-founded the
Young Sustainable Finance network. He holds a Cum Laude degree in Finance &
Investments from the Rotterdam School of Management.
Flo is a dynamic professional with a deep commitment to sustainable finance. As our
investment associate at PhotonVentures, he will harness his expertise to drive
meaningful investments in the fields of deeptech and integrated photonics.
Casper Vissers Technical investment analyst
Casper Vissers Technical investment analyst
Casper Vissers joined PhotonVentures as a technical investment analyst in September 2024. He holds a Master’s degree in Econometrics and Operations Research with a specialization in Financial Econometrics from VU Amsterdam, and a Master’s degree in Aerospace Engineering with a specialization in Space Engineering from TU Delft. Casper's diverse academic background and passion for cutting-edge technology drive his contributions to PhotonVentures' innovative investments.
In his free time, Casper enjoys staying active through field hockey, fitness, and playing squash. He also has a strong interest in finance and is passionate about merging his knowledge of science and finance to create meaningful impacts. A dedicated learner, Casper is always eager to tackle new challenges and develop his skills further. His proactive approach and commitment to making a positive difference make him a valuable addition to our team.