Our people

All together different — We're independent, multi-disciplinary real estate technical experts, project managers, and sustainability consultants. We understand how buildings work and how they perform. Meet our team.

Consultant

Mick Diepstraten

+31 6469 20497

[email protected]

Consultant

Project Management Consultant at Hollis with 30+ years’ industry experience
Background across project management, engineering, and consultancy
Extensive expertise in acquisition, development, and construction of large‑scale, multi‑disciplinary projects
Highly experienced in coordinating multidisciplinary teams and stakeholders, including authorities, advisors, and financial partners.

Case Studies

Cost Management

The Student Hotel in The Netherlands

Managing the cost of purpose-built student accommodation developments across Europe.

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Multidisciplinary services

Monarch Tower II in The Hague, The Netherlands

Future ready advice for a prime office asset in The Hague.

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News & Insights

News 04 SEP 2025

Q+A: Hollis CEO sets out European blueprint

In a recent interview with Green Street News, Andy Hay, CEO, shared our vision for the next chapter of our journey in continental Europe.

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Insights 04 MAY 2025

Looking to Europe in the face of global uncertainty: Andy Hay explains Hollis’s plans for growth

Andy Hay, our CEO, shares his journey, the unique perspective he brings to Hollis, and how we’re expanding across Europe.

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News 10 DEC 2025

Hollis Highlights 2025

2025 has been an incredible year at Hollis, packed with achievements, growth and milestones we’re proud of.

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