A former California-based hedge fund manager who took the stand in his own defense was convicted of insider trading, the New York Times DealBook blog reported yesterday. After less than a day of deliberations, a federal jury found Doug Whitman of Whitman Capital in Menlo Park, Calif., guilty of earning about $1 million in illegal profits trading technology stocks. Whitman faces a maximum possible sentence of 25 years in prison, and his sentencing is set for Dec. 20.