Although based in Boston, he has tried cases and presented appellate arguments in many other state and federal courts. He is a member of the bar of the Supreme Judicial Court of Massachusetts, the U.S. District Court for the Districts of Massachusetts, Western Pennsylvania, Southern Ohio, Western Texas and Arizona. He is also a member of the United States Circuit Courts of Appeals for the First, Second, Third, Fifth, Sixth, and Eleventh Circuits, as well as the United States Supreme Court.