First film appearance was as an uncredited extra in The Ten Commandments (1956).
First major film role was in the 1957 western Hell's Crossroads.
Most famous for playing Napoleon Solo in the 1960s TV series The Man from U.N.C.L.E.
Even after achieving fame as an actor, he continued his education, earning a Ph.D. in Communications from the University of Southern California in 1970.
Was involved for many years in political causes; a longtime Democrat, he campaigned for candidates such as John F. and Robert F. Kennedy.
Was a member of the Vietnam War-era group Another Mother for Peace, as well as Dissenting Democrats.
Received a star on the Hollywood Walk of Fame in 1998.
1965, Golden Globe — Actor in a Television Series: Nominee
1970, BAFTA Film Awards — Best Supporting Actor: Nominee
1960, Golden Globe — Best Performance by an Actor in a Supporting Role in a Motion Picture: Nominee
1979, Emmy — Outstanding Supporting Actor in a Limited Series or Special: Nominee
1966, Golden Globe — Actor in a Television Series: Nominee
1959, Oscar — Best Performance by an Actor in a Supporting Role: Nominee
1961, Golden Globe — New Star of the Year - Actor: Nominee
1978, Emmy — Outstanding Continuing Performance by a Supporting Actor in a Drama Series: Winner
Caitlin Vaughn — Daughter
Linda Staab — Wife
John Ladd Connor — Stepfather
Marcella Gaudel — Mother
Gerald Walter Vaughn — Father
Cassidy Vaughn — Son
Attended University of Minnesota, Minneapolis, MN, United States; attended Los Angeles City College, Los Angeles, CA, United States; Los Angeles State College of Applied Arts and Sciences, Los Angeles, CA, United States (MA in Drama)