Theo Marchetti
Founding Partner, New York
Theo Marchetti co-founded DSD Invest and opened the New York office in 2014, two years after the firm started in London. He invests in developer tools, security and the infrastructure underneath modern software.
Theo spent a decade writing and then managing code at a cloud hosting company in Boston, ending up responsible for a team of sixty engineers. He tends to judge infrastructure companies by their documentation and their first ten customers rather than their pitch deck, and he will often ask to sit in on a support call before a partner meeting. He led the seed rounds in Gatehouse and Corvid, both since acquired, and is on the board of Stackwell.
Theo keeps a plot at a community garden in Queens and grows more tomatoes than his family can eat.
- Focus
- Infrastruktur Software
- Previously
- Engineering lead at a cloud hosting company in Boston
- At DSD Invest since
- 2012
- Office
- New York
Writing

Essays · September 16, 2026
The case for the long first cheque
Why we write fewer, larger first cheques, hold back more than half of each fund for follow-ons, and accept the slower pace that comes with both.
Theo Marchetti
Investor letters
2025
Investor letters · January 22, 2026
Annual letter, 2025
Our annual letter to the partners in our funds: closing Fund V, the sale of Ostra, Tidewater's first year as a public company, and the first five Fund V investments.
Nadia Mensah and Theo Marchetti