John Diaz, American lawyer. Bar: New Jersey 1969, United States District Court New Jersey 1969. Member of Lawyers Alliance Nuclear Arms Control (board directors since 1983), Hispanic Bar Association, East Orange Bar Association (treasurer 1972), Morris County Bar Association, Essex County Bar Association, New Jersey Bar Association.
Partner Diaz & Costello, East Orange, New Jersey, 1969—1975, Morristown, since 1984. Assistant prosecuting counsel, East Orange, 1972. Sole practice, East Orange, 1975—1980, Montclair, 1980—1983.
Served with United States Marine Corps, 1956-1959.