The son of famed pianist and composer Arthur Rubinstein, John Rubinstein has distinguished himself as both a character player and occasional leading man of stage and screen and as a respected film and TV composer.Thin, with curly hair, Rubinstein has often played staid or intellectual characters, but has proven adept at portraying weak husbands and licentious studio executives. After attending the Juilliard School of Music, he moved to the West Coast where he began his showbiz acting career on stage in a local production of "Camelot" and his feature film debut playing a Confederate soldier in "Journey to Shiloh" (1965). He went on to star in the odd rock 'n' roll Western "Zachariah" (1971), for which he also composed several songs, and landed a substantial supporting role in "The Boys From Brazil" (1978), as a zealous American Jewish Nazi hunter aiding Laurence Olivier's faux Simon Weisenthal in searching for Josef Mengele. The next year, 1979, he played the title role in the docudrama "The Search for Historic Jesus". In 1983, Rub