Biography
Jerry Nelson (July 10, 1934 – August 23, 2012) was an American puppeteer, best known for his work with The Muppets. Renowned for his wide range of characters and singing abilities, he performed Muppet characters on Sesame Street, The Muppet Show, Fraggle Rock, and various Muppet movies and specials. Description above from the Wikipedia article Jerry Nelson, licensed under CC-BY-SA, full list of contributors on Wikipedia.
Known For

The Muppets
Telethon Announcer (voice) (uncredited)

Sesame Street | All-Star ...
Count von Count / Herry Monster

A Walking Tour of Sesame ...
The Count / Mr. Johnson / ... (archive footage) (uncredited)

The Muppets Celebrate Jim...
Robin the Frog / Lew Zealand / Floyd Pepper / Announcer (voice)

Sesame Street: Elmo Says ...
The Count

The Muppet Christmas Caro...
Tiny Tim Cratchit / Jacob Marley / Ghost of Christmas Present / Lew Zealand / Ma Bear / Mouse / Mr. Applegate / Penguin / Pig Gentleman / Pops / Rat (voice)

Christmas Eve on Sesame S...
Snuffy / The Count (voice)

John Denver and the Muppe...
Camilla / Lew Zealand / Robin the Frog / Sgt. Floyd Pepper (voice)

Sesame Street: Cookie Mon...
Green Anything Muppet Boy / Announcer (voice)

Sesame Street: Sing, Hoot...
The Big Bad Wolf / Farmer Brown / Boy (voice)