Donald Fredric Costello, American lawyer. Bar: California 1974, United States Supreme Court 1980. Member planning commission City of Belmont, California, 1976; Member of American Bar Association, Million Dollar Advocates Forum (president), American Society Law and Medicine, California Trial Lawyers Association (contributor articles to Forum), Association Trial Lawyers American.
Associate Frolik-Filley & Schey, San Francisco, 1974—1978. Member Salomon & Costello, 1978—1980, Law Offices Donald F. Costello, Palo Alto, California, 1980—1984, Santa Cruz, since 1984. Lecturer University Santa Clara, 1980, Stanford University, 1983.
Faculty Hastings College Trial Advisory, since 1988. Expert witness on medical malpractice law California Senate Judicial Committee, 1987.