Bernard Morton `` Bernie '' Kopell ( born June 21 , 1933 ) is an American character actor known for his roles as Siegfried in `` Get Smart '' from 1966 to 1969 and as Dr. Adam Bricker ( `` Doc '' ) in ABC 's `` The Love Boat '' from 1977 to 1986 .
Bernard Morton `` Bernie '' Kopell ( born June 21 , 1933 in Brooklyn , New York ) is an American actor . He is best known for his roles as Siegfried in `` Get Smart '' and as Dr. Adam Bricker ( `` Doc '' ) in `` The Love Boat '' from 1977 to 1986 .