in a courtroom in sanford, florida, all eyes are on mark o'mara, this long-time florida lawyer is charged with defending george zimmerman. o'mara is the lead defense attorney in a trial the entire nation is watching, so just who is he? george howell digs deep to find out. >> reporter: he's been described as brilliant, a tactician, hallmarks of a skillful trial attorney. >> if we were to take pathological liar off the table for the purpose of this next question, you think he was telling the truth? >> yes. >> there's always one more thing. >> reporter: mark o'mara, in the spotlight like never before, defending a man once described as the most hated man in america, george zimmerman. o'mara's resume is long, nearly three decades of lawyering experience, mostly as a family attorney operating out of the