Clue 1: I was born in Mississippi on September 24, 1936. I became a puppeteer.
Clue 2: I created the Muppets. Kermit the Frog and friends appeared on Sesame Street, which started in 1969. Later, they starred on The Muppet Show and in movies.
Clue 3: I was Kermit's voice until my death in 1990.
Who am I? _________________