What our clients
say about working with us
Randstad
“For Randstad, benchmarks like the CSA and CDP are not goals in and of themselves. They help us reflect on where we stand, where we can improve, and how to translate our sustainability ambitions into actionable steps. The Overview Effect helps us stay focused on that.”
– Sandra Swinkels, Senior Global Sustainability Specialist
Johan Cruijf ArenA
“We had the ambition, but The Overview Effect brought structure. With their support, we moved from scattered initiatives to measurable impact and made sustainability something the entire organization could steer on.”
– Pelle de Laaf, Manager Finance & Reporting
nexeye
“There is still a lot of work to do, but we now have direction and a horizon. And that works. We see it reflected in audits, in feedback from stakeholders, and in the growing engagement across the organisation.”
– Rian van Koulil, Director Brands & Corporate Communication
Blycolin
“Colleagues felt overwhelmed at first. But by breaking things down into manageable steps and asking the right questions, The Overview Effect helped turn this challenge into a starting point for real change.”
– Nicolet Keetelaars, ESG Manager
Beens Groep
They do excellent work, they’re great to work with, and they truly think alongside you.
It’s not a ‘we’ll just fix it for you’ mentality — it’s solving the puzzle together until it fits.”
– Anneké Slenters, Sustainability Lead
Meet the team
behind the work.
Stan
Junior Consultant
Olivier
Co-founder
Koen
Co-founder
Jip
Senior Sustainability & CSRD Consultant
Lena
Co-founder
Mark
Junior Sustainability Consultant
Nick
Partner
Tim
Sustainability consultant
Melati
Junior Consultant
Koen
Co-founder
About Koen
After years of working as a freelancer within a collective, Koen seized the opportunity to help build The Overview Effect.
His journey toward sustainability has not been linear. Initially uncertain of his direction, he completed a master’s in Business & IT at the Erasmus University. While his peers joined strategy consultancies and tech giants, Koen felt compelled to seek deeper meaning. His concern about climate change – ironically sparked by extensive travels – led him to start his career in the energy transition sector. Over the decade, his focus has broadened to the broad field sustainability is today. At The Overview Effect, Koen’s mission is to mobilize and empower top sustainability professionals for more impact.
Get to know Koen better: read his interview on co-founding The Overview Effect!
Olivier
Co-founder
About Olivier
Originally from Switzerland, Olivier now calls the Netherlands home, attracted by its innovative approach to sustainability.
As a co-founder of The Overview Effect, he excels in developing sustainable strategies and calculating carbon footprints, leveraging over eight years of experience in sustainability consulting and ESG software implementation. Olivier’s passion for sustainability was sparked early on by his family’s involvement in car sharing and fair trade during the early ’90s. He now leads The Overview Effect’s Young Professionals program, empowering the next generation to drive impactful change.
Get to know Olivier better: read his interview on co-founding The Overview Effect!
Lena
Co-founder
About Lena
As a co-founder of The Overview Effect, Lena is committed to creating a workplace where joy, idealism, and optimism are at the heart of driving sustainable change.
With ten years in the field, including founding roles and consulting, Lena advocates for a business model that prioritizes the planet and people over profit. She champions a collaborative approach, encouraging us to rethink competition, assess our real needs, and foster generosity among colleagues to achieve collective success.
Get to know Lena better: read her interview on co-founding The Overview Effect!
Nick
Partner
About Nick
Nick brings a wealth of experience to The Overview Effect, having honed his skills at The Big Four and as a partner at ERM, where he led a market-leading sustainability consultancy.
Today, he’s dedicated to supporting sustainable entrepreneurs, helping them maximize their journey’s potential. Nick is passionate about building bridges that enhance collaboration, drive results, and amplify impact. With his extensive network, Nick excels in creating synergistic partnerships where the collective outcome is greater than the sum of its parts—truly embodying the 1+1=3 philosophy.
Jip
Senior Sustainability & CSRD Consultant
About Jip
With a talent for bringing clarity to complexity, Jip has a gift for translating sustainability ambitions into actionable strategies. Her work spans CO2 calculations at ANWB Retail to Net Positive initiatives at the Johan Cruijff ArenA, always driven by her belief in collaboration for lasting change.
As a certified B-Leader, Jip is passionate about using business as a force for good. Outside work, she’s happiest outdoors or hosting cozy game nights. At The Overview Effect, Jip combines her structured, enthusiastic approach with her passion for nature to make sustainability tangible.
Mark
Junior Sustainability Consultant
About Mark
Motivated by the urgency of climate action, Mark combines a sharp analytical mind with enthusiasm, positivity and a passion for creating meaningful impact.
During his master’s in Global Business & Sustainability at Erasmus University, he wrote his thesis on the CSRD adoption of Dutch Financial Institutions and gained hands-on experience in ESG reporting during an internship at ABN AMRO. As an account manager at AIESEC, he honed his skills in problem-solving, building strong client relationships and fostering collaboration. Beyond his professional pursuits, Mark is a sports enthusiast who enjoys football, calisthenics and running, and he is also interested in foreign languages.
Now part of The Overview Effect’s Young Development Program, Mark is eager to support organizations in reducing their environmental footprint and embracing sustainable transformation.
Melati
Junior Consultant
About Melati
Driven by a passion for sustainability and a scientific mindset, Melati brings a unique blend of analytical rigor and strategic insight to The Overview Effect.
Melati works as a Junior Consultant while participating in the Young Development Program. She explores diverse sustainability challenges, develops her expertise, and supports businesses in moving beyond compliance towards real impact. Melati’s strength lies in her ability to connect technical and social aspects of sustainability, helping organizations build credible and resilient strategies.
Beyond her role, Melati’s creativity shines through her love for singing, dancing, making music, and enjoying concerts, museums, and festivals. A fun fact: her name comes from an Indonesian flower, a tribute to her roots.
Stan
Junior Consultant
About Stan
Stan recently joined The Overview Effect as a Junior Consultant, bringing a fresh perspective and enthusiasm to the team. This role marks the start of his journey in sustainability consulting, and we’re excited to support his growth and development.
Stan is also part of the Young Development Programme, where he will be sharpening his skills and gaining valuable insights into the sustainability consulting field over the next two years. His commitment to learning and dedication to making an impact align perfectly with our approach at The Overview Effect. Stan’s energy and commitment to sustainability are a great fit for our team. We’re looking forward to seeing his impact and supporting his journey.
Tim
Sustainability consultant
About Tim
From the moment he watched An Inconvenient Truth in high school, Tim knew he wanted to dedicate his career to sustainability.
At The Overview Effect, Tim helps businesses decarbonize while unlocking strategic advantages. His pragmatic, no-nonsense approach to sustainability is rooted in the belief that businesses shouldn’t make decisions based on today’s reality—they should prepare for tomorrow’s opportunities. As Tim puts it: “The energy transition train has left the station—next stop: cheap energy!”