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.

  • 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

  • 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

Logo with the words 'CONILIUM' in large stylized letters and 'digital expertise' below in smaller font.

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