Jack Sinclair

Return Path, Inc. engages in the provision of email data solutions. It offers email optimization, email fraud protection, and client services. The company was founded by Matthew Y. Blumberg, George Bilbrey and Jack Sinclair in 1999 and is headquartered in New York, NY.

Stack Exchange, Inc. operates a network of question and answer sites on diverse topics. It operates websites for software developers, including Stack Overflow, a site for programmers to find, ask, and answer their questions serving professional and novice programmers each month. The firm also expands to cover topics as diverse as mathematics, home improvement, statistics, and english language and usage. The company was founded by Joel Spolsky, Michael Howard Pryor and Jeff Atwood in 2008 and is headquartered in New York, NY.

Bolster Networks, Inc. provides commercial business services. The company was founded by Matthew Y. Blumberg, Shawn Nussbaum, Ken Takahashi, Nick Badgett, Cathy Hawley, Jack Sinclair, Andrea Ponchione and Jennifer Goldman in April 2020 and is headquartered in Indianapolis, IN.

Stern Value Management Ltd.. provides management consulting services. The firm advises clients in transaction, strategy, performance, and transformation. The company was founded by Joel M. Stern on November 1, 1982 and is headquartered in New York, NY.