Biography
William Lee (born William Lubovsky; August 6, 1908 – December 7, 1982) was an American actor who appeared in numerous television and film roles, but was best known for playing Mr. Hooper, the original store proprietor of the eponymous Hooper's Store. He was one of the four original human characters on Sesame Street, from the show's debut in November 1969 until his death on December 7, 1982, at the age of 74. Description above from the Wikipedia article Will Lee, licensed under CC-BY-SA, full list of contributors on Wikipedia.
Known For

A Sesame Street Christmas...
Mr. Hooper (archive footage)

An Affair of the Skin
Waiter

Whistling in the Dark
Herman the Druggist

Babes on Broadway
Shorty, Drugstore Waiter / Cook (uncredited)

Backfire
Cab Driver (uncredited)

Playing for Time
Shmuel

A Special Sesame Street C...
Mr. Hooper

Daniel
The Judge

Little Fugitive
Photographer

Sesame Street at Night?
Mr. Hooper (archive footage)