He practiced accounting on his own from 1976 until March 2003, when he joined Margolis & Company P.C. (" Margolis" ) as a non-equity partner. Trial Tr. (" Tr." ) 416-17, Nov. 30, 2012. At Margolis, located in Pennsylvania, the plaintiff performed a mix of forensic and tax-related work for individuals and businesses. Id.; Tr. 62, Nov. 27, 2012. He brought to Margolis his own clients. See Marcum Trial Exhibit (" Def. Ex." ) 265. Six more clients were acquired by him while he worked for Margolis. Tr. 759:18-23, Dec. 13, 2012.