What does firstmark capital do? Overview. FirstMark Capital is an early stage venture capital firm based in New York City. The firm's mission is to partner with exceptional entrepreneurs who are changing the world by solving meaningful problems. It has built a deeply engaged community among the extraordinary teams in its network to spread ideas and opportunities.Who is the founder of firstmark? Prior to founding FirstMark, Mr. Heitzmann served as a Partner at Pequot Ventures from 1999 to 2008. In addition, Mr. Heitzmann was a founding member of the senior management team at First Advantage (Nasdaq: FADV) from 2003 to 2004 which he helped grow and sell to First American (NYSE: FAF).Where is firstmark credit union located? Firstmark Credit Union was chartered on Nov. 25, 1932. Headquartered in San Antonio, TX, it has assets in the amount of $905,169,938.