Herengracht 182, 1016 BR Amsterdam
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Construction team on site
HomeOur Team
The People

120+ professionals, one shared standard.

Behind every Cornerstone project is a team of architects, engineers, project managers, and skilled tradespeople who take personal pride in what they build.

Leadership
Senior team driving every decision

Our leadership team brings over 80 years of combined experience across residential, commercial, heritage, and sustainable construction.

Willem van der Berg
CEO & Founder
Willem van der Berg
Founded Cornerstone in 2003. Over two decades leading complex residential and commercial builds across the Netherlands.
Katrin Hoekstra
Lead Architect
Katrin Hoekstra
Award-winning architect specialising in residential design. Former partner at MVRDV with 15+ years of experience.
Henry Mulder
Head of Engineering
Henry Mulder
Structural engineering specialist with expertise in high-rise construction and heritage foundation reinforcement.
Maren Visser
Project Director
Maren Visser
Oversees all active projects and client relations. 12 years in construction project management across Europe.
Cornerstone team on site
"The best part of this job is the people you build with."
Annual team day, Amsterdam — 2024
120+
Team Members
22
Years Experience
8
Departments
1
Office Location
Department Leads
Key people across our organisation
Jan Willem Smit
Sustainability
Jan Willem Smit
BREEAM Assessor & Green Build Lead
Eva Mulder
Finance
Eva Mulder
CFO & Budget Control
Marco Visser
Site Operations
Marco Visser
Head Foreman · 18 years on-site
Ingrid Kok
Heritage
Ingrid Kok
Heritage Architect & Monuments Liaison
Bas Hendriks
MEP Engineering
Bas Hendriks
Mechanical, Electrical & Plumbing Lead
Nina de Jong
Client Relations
Nina de Jong
Head of Business Development
Our Values
What guides how we work every day
Integrity First
We say what we mean and deliver what we promise. Transparent pricing, honest timelines, no surprises.
Relentless Quality
Every material, every joint, every finish is held to the highest standard. We don't cut corners — ever.
People Matter
Our team is our greatest asset. We invest in training, safety, and well-being — because great people build great things.
Team on site
Join Us

Build your career at Cornerstone

We're always looking for talented engineers, architects, project managers, and skilled tradespeople who share our commitment to excellence.

Competitive salary & profit sharing
Continuous professional development
Work on landmark projects
View Open Positions