Len Lesser. Actor: Stoßtrupp Gold. Len Lesser was an American character actor, from the Bronx, New York City. His most famous role was that of Uncle Leo, the maternal uncle of protagonist Jerry Seinfeld in the sitcom "Seinfield". Lesser played this role from 1991 to the series finale in 1998. Lesser was the son of a Polish-Jewish immigrant, who worked as a grocer in New York City. Lesser was educated at...