Fritz Reuter Leiber Sr. was an American actor. A Shakespearean actor on stage, he also had a successful career in film. He was the father of science fiction and fantasy writer Fritz Leiber Jr., who was also an actor for a time. Leiber and his wife spent much of their time touring in a Shakespearean acting company, known by the 1930s as Fritz Leiber & Co. Leiber made his film bow in 1916, playing Mercutio in the Francis X. Bushman version of “Romeo and Juliet.” With his piercing eyes and shock of white hair, Leiber seemed every inch the priests, professors, musical professors, and religious fan…