Mike Kimelman co-founded Incremental Capital, a proprietary-trading firm. On a November day at 5:30 a.m., he was greeted by a half-dozen federal agents with German Shepherds. His then-wife and children were sequestered in the master bedroom while he was charged for conspiracy and illegally trading shares of 3Com in 2007. He served 21 months in prison. In this Q&A, Kimelman tells ex-Galleon trader Turney Duff about the fear of going to prison, that day and how it changes you.

Michael Kimelman, co-founder of Incremental Capital, leaves federal court after being sentenced in New York, Oct. 12, 2011.

Duff: After receiving your law degree and working in corporate law, you headed to Wall Street to work for a prop shop. What was the biggest draw?