Our people

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.

Christo Müller

Project Management Director

Christo Müller

  • Amsterdam based Director and Head of The Netherlands office
  • Specializes in Cost Management, Development Management and Project Management
  • 20+ years industry experience.

Case Studies

The Student Hotel Social Hub Amsterdam

Cost Management

The Student Hotel in The Netherlands

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

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Karl Lagerfeld HQ in Amsterdam, The Netherlands

Project Management and Cost Management

Karl Lagerfeld HQ in Amsterdam, The Netherlands

Relocation of the eponymous fashion brand.

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News & Insights

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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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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“Throughout my career in the construction industry, I have developed a deep passion for cost management, recognising it as the cornerstone of delivering value. By balancing efficiency of service with quality of information I have proudly support both individual clients and larger organisations to revisit how the deliver, what they focus on and how to improve. I greatly enjoy sharing my passion and experience with clients and colleagues alike and very much looking forward to doing exactly that in my new role at Hollis. Cost management should be everything about creating smart solutions that not only meet today’s needs but also lay the foundation for future growth.”