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.

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James joined Gresham House Ventures in December 2019 as an Investment Manager and was promoted to Investment Director in 2024. He focuses on investing into high-growth enterprise software and services businesses, with a focus on process automation, data and analytics, and cybersecurity solutions.

At GHV, James has led investments in Fu3e, OzoneAPI and Veremark, and serves as Investor Director on the board of SecureCloud+.

Prior to joining GHV, James spent five years at PwC, most recently in the financial due diligence team. He is a Chartered Accountant (ICAEW) and holds an MA in Economics and Accounting from the University of Edinburgh.

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