MANDATES
FOUNDERS WE SUPPORT – PAST AND PRESENT
We work selectively with founders who build meaningful companies. Every mandate is a long-term partnership built on trust, clarity and high-quality boardwork.
FOUNDER AND FORMER FELLOW BOARD MEMBER VOICES
What founders say about working with Chairpeople.
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He brings clarity, speed, and true entrepreneurial judgement.
I wouldn’t have built — or sold — my company the way I did without him.
Up until Jonah joined the company, I was a single founder for years. As a single founder, there are moments where you simply don’t know who you can talk to. Employees, angels, partners, friends – everyone has their own lens, their own agenda, their own limits. The real question becomes: Who do you call when it truly matters? For me, that person was always Niels.
Niels guided me through the toughest stages. He pulled me out of the operational tunnel, helped me regain altitude, and pushed me toward the decisions that actually mattered – not through pressure or control, but through real entrepreneurial thinking. He understands what it means to carry the weight alone.
What sets him apart is his speed. He dives into a situation he hasn’t been part of day-to-day, connects two or three dots from other companies, and within minutes you have a clear direction. Every session with him ends with clarity for the next quarter. No theory. No consulting speak. Just founder-level truth.
Several turning points in the VetStage journey would not have happened without him: he encouraged me before I even started the company – and insisted that I keep the majority. That decision changed everything. He saw strategic shifts months or years before I could execute on them: moving from a one-sided to a two-sided platform, launching public profiles, and later building our education ecosystem. All of this became core to our product and our growth.
And when it came to succession and the sale of the company, he was the person I relied on again. Not just as a strategist, but as someone who understands the founder’s perspective. Timing, investor type, boutique selection, the decision-making process – he gave me the confidence I needed not to take the wrong turn at the wrong time.
If I had to put it in one sentence: I would not have built VetStage this way – nor sold it this way – without Niels. He was the one person I could always call, and he always told me what I needed to hear, not what I wanted to hear.
CHRISTOPHER WALDNER | Founder and CEO
DR. CHRISTOPHER MCLACHLAN | Former fellow Advisory Board Member
and Head of Sales Innovation at RheinEnergie AG
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Too many advisory boards in young companies fall back into a purely formal role. Their creative potential and networks remain untouched, and board meetings turn into administrative routines that drain founders instead of strengthening them.
Working with Niels — whether as a founder or as a fellow board member — is the exact opposite. With his passionate style and deep experience as a founder, investor, and corporate leader, he creates an energised environment that blends strategic clarity with hands-on support, sharp advice, and true network activation. It makes a huge difference — every single time.What makes you (Niels) stand out:
Fluent across worlds
He speaks Corporate, Venture Capital and Startup —
… grounded in real experience in all three
… and acts as a translator and bridge between founders, strategics, and investors.Outcome-driven and focused
He brings discipline and focus into every board discussion
… without dominating the conversation
… sharing the experience others can build on
… and demanding clarity of goals and priorities from everyone involved.Passionately forward-looking
He pushes discussions toward “how do we make this better?”
… without ever avoiding uncomfortable truths
… and brings high energy and creativity to every decision, solution, and strategic perspective.
MARIO WITTE | CTO
NICO ZEIFANG | CEO
ANDREAS BRUCKSCHLÖGL | Managing Director
DR. SEPITA ANSARI | CEO
MATTHIAS WETH | CAO
Active Mandates: Companies we currently accompany.
Past Mandates: Companies we supported through critical stages to success.
Niels Dörje
Board Observer and Industry Board Director
Business model:
B2C Fantasy Football Manager App
Anatol Korel
CEO & Co-Founder
Johannes Feldges
CBO
▽ 2025
Niels Dörje
Start-up Board Member (NED)
Business model:
Förderung der Agrar- und Ernährungswirtschaft
Dr. Christian Bock
Managing Director Bereichsleiter Fördergeschäft
Niels Dörje
Senior Advisor
Business model:
M&A and Corporate Finance Advisory
Ralf Philipp Hofmann
Managing Partner & Co-Founder
Julian Ostertag
Managing Partner / Co-Founder
▽ 2024
Niels Dörje
Industry Board Member
Business model:
KI Plattform
Dr. Tim Rietz
Founder
Niels Dörje
Industry Board Member
Business model:
B2B SaaS MarTech
Johanna Hartung
Founder
Timon Hartung
Founder
▽ 2023
Ronjon M. Sarcar
Industry Advisor
Business model:
Social Affiliate Marketing
Marcel Schöne
Founder
Jan Haarhoff
Founder
Niels Dörje
Supervisory Board Member
Business model:
B2B SaaS Travel Tech
Martin Tauber
Founder
Dott. MSc. Hubert Rienzner
Founder
▽ 2021
Niels Dörje
Industry Board Director
Business model:
Digital value exchange
Theofanis Alexandropoulos
Founder & CEO
Niels Dörje
Advisor and Coach
Business model:
Digital innovation hub
Dr. Dexin Luo, Ph.D.
Head of AI Solutions & Technologies
Niels Dörje
Industry Board Member
Business model:
UI/UX Agency
Felix van de Sand
Managing Director & Co-Founder
Daniel Wagner
Managing Director UX & Co-Founder
2022 trade sale to Etribes Connect GmbH
▽ 2020
Niels Dörje
Chair of investment committee
Business model:
International non-profit organisation
Vasilis Koulolias
Founder
Warren Hero
Chairman
Niels Dörje
Growth Advisor and Coach for Realytix
Business model:
Digital innovation hub
Andreas Molck-Ude
CEO at NewRe
Florian Niklas
Head of Realytix
Niels Dörje
Strategic Growth Mentor to the Founders
Business model:
Hospitality B2C Business
Dr. Josef Vollmayr
CEO & Co-Founder
César de Sousa Freitas
MD & CFO
▽ 2018
Niels Dörje
Advisory Seat
Business model:
Blockchain banking
Kristina Walcker-Mayer CEO
Jörg von Minckwitz
Co-Founder
Ben Jones
Chairman & Co-Founder
Jan Goslicki COO & Co-Founder
Niels Dörje
Advisory Board Director
Business model:
IoT SaaS in industry
Til Landwehrmann
CEO & Co-Founder
Dr. Michael Kolb
CTO
2024 trade sale to Banyan Software
Ronjon M. Sarcar
CEO & Co-Founder
Business model:
Strategy Consulting
Silvia Sarcar
Co-Founder
2024 trade sale to netzunit GmbH
▽ 2017
Niels Dörje
Chairman of the Board
Business model:
Digital performance agency
Oliver Zenglein
CEO & Co-Founder
Nicole Rainer
COO
Niels Dörje
Advisor and Coach
Business model:
SP digital launch pad
Marcus Graser
Head of Strategy & Marketing SP
Michael Jacobi
Manager SP Digitallaunchpad
Niels Dörje
Chairman
Business model:
Digital product agency
Dott. MSc. Hubert Rienzner
Managing Director & Co-Founder
Martin Tauber
Managing Director
▽ 2016
Niels Dörje
Chairman of Innovation Board
Business model:
open innovation hub by Sky Deutschland
Julia Laukeman
Senior Vice President Product & Digital Innovation
Mareike Lassner
Senior Project Manager Open Innovation Hub
Niels Dörje
Advisory Board Member
Business model:
Digital performance agency
Dr. Sepita Ansari Pir Seraei
CEO & Co-Founder
Matthias Weth
CEO & Co-Founder
Frank Hohenleitner CCO
Axel Landschoof CTO & CFO
2017 trade sale to Syzygy AG majority owned by WPP
Niels Dörje
Advisor and Coach
Business model:
Digital innovation hub
Philipp Karmires
Head of Linde Digitalisation
Dr. Mathias Mostertz
Senior Business Development Manager
▽ 2014
Niels Dörje
Supervisory Board Member
Business model:
Domain platform tech business
Nico Zeifang
CEO & Co-Founder
Mario Witte
CTO & Co-Founder
Stefan Wiegard
CFO & Co-Founder
2014 trade sale to Israel's Matomy Media Group
▽ 2012
Niels Dörje
Board Director & Co-Founder
Business model:
B2B SaaS MarTech
Marcus Tandler
Managing Director &
Co-Founder
Andreas Bruckschlögl
Managing Director &
Co-Founder
2024 trade sale to Semrush Holdings, Inc.
▽ 2010
Niels Dörje
CEO & Co-Founder
Business model:
Travel tech marketplace
Dr. Ulrich Eckert
COO & Co-Founder
Michael Frischkorn
CTO & Co-Founder
Jürgen Böhm
Chairman & Co-Founder
2014 trade sale to HRS Group Cologne
▽ 2009
Niels Dörje
Advisory Board Member
Business model:
B2B SaaS in travel
Benjamin Jost
CEO & Co-Founder
Jakob Riegger
COO & & Co-Founder
Steffen Wenz
CTO
2017 trade sale to Japanese Media Group Recruit
▽ 2004
Ronjon M. Sarcar
CEO & CO-Founder
Business model:
Performance Agency
2008 Trade Sale to Dentsu Media
▽ 1998
Ronjon M. Sarcar
CEO & CO-Founder
Business model:
Freelancer Market
Rolf Kuhlmann
Co-Founder
Tjalf Nienaber
Co-Founder
Kambiz Hashemian
Co-Founder
2000 Management Buy-out
Ronjon M. Sarcar
CEO & CO-Founder
Business model:
Freelancer Market
Tjalf Nienaber
Co-Founder
1999 Trade Sale to Scou24 GmbH
▽ 1995
Ronjon M. Sarcar
CEO & CO-Founder
Business model:
Greencard Service
Rolf Kuhlmann
Co-Founder
Kambiz Hashemian
Co-Founder
2003 Trade Sale to The American Dream - US GreenCard Service GmbH
Ronjon M. Sarcar
CEO & CO-Founder
Business model:
Websolutions & online Marketing
Rolf Kuhlmann
Co-Founder
Kambiz Hashemian
Co-Founder