If longevity counts for anything, Ron Glass is an American actor whose name has been turning up in credits for decades. He has been working on screen for more than 53 years. In cinemas, 'Serenity' is the work that stuck — Shepherd Derrial Book, specifically. 'Firefly' counts among the more visible credits. Viewing habits have changed more than once since the first credit. More of the credits fall under comedy than under anything else. Read more