Background
Costello, John L. was born on June 13, 1930 in Carlisle, Pennsylvania, United States.
Costello, John L. was born on June 13, 1930 in Carlisle, Pennsylvania, United States.
Dickinson College (Bachelor of Arts, 1952). Dickinson School of Law (Juris Doctor, 1955). Fletcher School of Law and Diplomacy (Master of Arts, 1964).
University of Virginia (Master of Laws, 1975).
Admitted to the bar, 1956, Pennsylvania. 1978, Virginia.