Younger brother of esteemed drama coach Stella Adler and a founding member of the influential Group Theatre. Adler began his career in the Yiddish theater and became a screen regular after World War II. He was memorable as the villainous object of Dick Powell's vengeful quest in the hair-trigger noir, "Cornered" (1945), and in an unforgettable cameo performance as a crazed Hitler in the screen bio of Rommel, "The Desert Fox" (1951). Adler only made occasional films after the late 1950s but did work on stage and television.