Getting typecast is a dangerous thing to do.

Zaslow's Broadway theatre credits included Fiddler on the Roof Cat on a Hot Tin Roof and Onward Victoria. He also costarred in the 1977 feature film You Light Up My Life. One of the show's central villains of the 1970s his first onscreen "death" was voted the top scene in the show's history when the series celebrated its 50th anniversary.

He was best known for his role as villain Roger Thorpe on CBS's Guiding Light a role he played from 1971 to 1980 and again from 1989 to 1997.