Semyon is a refugee from the Soviet Union and formerly the Managing Director of Techstars (Boston). Prior to Techstars, he was a prolific angel investor and a friend of the startup community. Semyon has made over 100 angel investments, including early investments in Quanergy, SMTP.com, and Wanderu. Xconomy lists Semyon as a top angel investor in New England. His philosophy has been to focus on helping his founders at all costs.

Prior to becoming a full-time angel, Semyon co-founded several technology companies including Vert and Fast Engines. Fast Engines was sold to Adero in 2000. Beyond startups, Semyon is known for leading one of the MIT blackjack teams in the early 90s. Semyon earned his B.S. from Columbia University and M.S. from MIT, both in Computer Science.