Leonard King "Len" Lesser (December 3, 1922 – February 16, 2011) was an American movie, television, voice, and stage actor. He was known for his role as Uncle Leo in "Seinfeld". He was born in New York City, New York on December 3, 1922. He was married to Janice Burrell from 1954 until they divorced in 1982. They had two children. Lesser died on February 16, 2011 in Burbank, California from pneumonia caused by his cancer. He was 88 years old.