Lenford "Lenny" Leonard is the best friend of Carl Carlson and, along with Carl, second best friend of Homer Simpson, behind Barney Gumble. He works at the Springfield Nuclear Power Plant and possesses a master's degree in nuclear physics, but he is portrayed as a simple, often naive, blue-collar working man.
Lenny is also one of the few characters allowed to possess a "Simpson's Family" trait: Homer's beard line. Despite being shown in the First Church of Springfield, Lenny is a Buddhist. Born in Chicago, he is also a war hero and a three-time juror. His grandmother spent 20 years in a Soviet labour camp, hinting that Lenny may have ancestors from the former Soviet Union, or have ancestors who were POWs. Lenny was a member of the Springfield chapter of the Stonecutters secret society (Number 12, outranking Mr. Burns). Lenny seems to have little regard for his own life: "Quick and pointless, that's the death for me". Another example of his apathy towards salvation is that he shrugs after being pulled from a ladder which would have seen him and M Drunk Lenny Homer to safety. In "Mommie Beerest", Lenny has a magazine cover from the week of his birth, the headline reads 'Bloodbath in Laos' this means his birth year is 1951, the time of the Laotian Civil War.