Penny Singleton had a pretty long career in show business but for the most part, it came down to two roles. From 1939 until 1960, she was Blondie (from the comic strip of the same name) in a string of radio shows and 28 movies that some cable channel ought to be rerunning. Then in 1962, she provided the voice of Jane Jetson for what was then a one season, unsuccessful cartoon series. But The Jetsons lived on in reruns to the point of eventually making more of them and Ms. Singleton became quite beloved as another cartoon mother. Somewhere between her two signature parts, she also became a mover and shaker in various actors' unions, holding office in some, always fighting for better pay and respect for the bit players, the dancers, the folks without much clout in the hierarchy of show business. I met her a few times and found her to be a delightful, spunky lady who clearly loved what she did, and loved the fact that so many others loved what she did. Here's a more extensive obit.