Leonard Thompson (1908 - 1935) is regarded as the very first person to have received injection of insulin as a treatment for diabetes. He received his first injection in Toronto, Ontario on January 11, 1922, at 14 years of age. The first injection had an apparent impurity which was the likely cause for the allergic reaction he displayed. After a refined process was promptly developed for extracting the insulin, the purified dosage was successfully delivered to young Leonard Thompson twelve days after his first dosage was administered. He then showed signs of improved health and went on to live 13 more years taking doses of insulin.

Until insulin was made clinically available, a diagnosis of diabetes was an invariable death sentence, more or less quickly (usually within months, and frequently within weeks or days).

Thompson died in a car accident 13 years after being first treated with insulin.

Leonard Stephen Thompson (born January 1, 1947) is an American professional golfer who has played on the PGA Tour, Nationwide Tour and Champions Tour.

Thompson was born in Laurinburg, North Carolina. He attended Wake Forest University in Winston-Salem, North Carolina and was a member of the golf team. He was a teammate of future fellow PGA Tour players Joe Inman and Lanny Wadkins. He graduated in 1969 and turned pro in 1971.

Thompson had more than 70 top-10 finishes in PGA Tour events during his career, winning 3 times. His first win came in 1974 at Jackie Gleason's Inverrary Classic. His best finish in a major championship was a T-7 at The Masters in 1979.

During his late forties, Thompson, like so many of his colleagues, played some on the Nationwide Tour to prepare for the Champions Tour. His best finish in that venue was a 6th at the 1996 NIKE Tallahassee Open.

After turning 50 at the beginning of 1997, Thompson began play on the Senior PGA Tour (now known as the Champions Tour). He has three wins on this Tour.

Thompson was inducted into the Wake Forest University Athletics Hall of Fame in 1997. He lives in Ponte Vedra Beach, Florida.

Leonard Irwin Thompson (born July 28 1952 in Oklahoma City, Oklahoma) was a National Football League wide receiver with the Detroit Lions from 1975 through 1986