Michael J. Petro Michael J. Petro Chicago criminal defense attorney Michael Petro isn't hesitant about calling himself the best criminal lawyer in Chicago. He has spent the past 28 years earning his reputation through hard work, dedication, and a relentless pursuit of giving hope to his clients. He has significant experience with both federal and state criminal cases. If you're looking for the best attorney, look no further than Michael Petro. Call Anytime.