Marieke joined Gresham House in February 2025 as Portfolio Director.

Marieke draws on over 15 years of industry experience. Prior to joining Gresham House Ventures, she was a senior investor and investment committee member at Forestay, a pan-European venture capital fund. She led a team focused on enterprise SaaS startups across the UK and Europe and served on the boards of four portfolio companies. Previously, she led the growth investment team at Octopus Ventures, serving on nine boards and managing new and follow-on investments as well as exits. She began her career in leveraged finance at NIBC (Frankfurt) and Credit Suisse (London).

Marieke has invested in and sat on the board of companies between £1m and £100m revenues and has deep experience supporting founders and management from first investment to exit.

She holds an MBA from Mannheim University. She is a mentor with Level20 and GAIN and serves as a Governor at West Wimbledon Primary School. Originally from Germany, she has lived in Spain and Mexico before moving to the UK in 2011.

 Outside of work, Marieke enjoys time with her family, yoga, snowboarding and the theatre.

Example portfolio

Martin is focussed on helping our portfolio companies to grow and achieve their full potential. With nearly 30 years’ experience in private equity and venture capital, and prior experience in the IT industry, Martin is currently working with several of our SaaS businesses.

I’ve been lucky enough to work with a wide range of companies, and in doing so have seen many examples of management best practice used successfully.  My role is to help our portfolio companies use those best practices to drive value growth for our entrepreneurs and investors.

Martin was previously an equity partner at Downing LLP, and has worked at Lloyds Banking Group plc, Livingbridge LLP, 3i Group plc, and IBM (UK) Ltd.

Martin has an MA in Engineering and was formerly a Chartered Engineer.

When not working Martin is a keen cyclist, although much of his free time is now spend on a larger than expected home refurbishment project.

Example portfolio