Wikipedia / BlueCerealEducation.com
Actor David Doyle played John Bosley on the original television show. Along with Kelly Garrett, he was the only actor to appear in every single episode.
Doyle began acting in 1959. After Angels, he voice acted the character Grandpa Lou Pickles on the cartoon Rugrats. He played the role until he died in 1997.
He was also a stage actor. Doyle played Orgon in the 1964 version of Tartuffe.