Conversation so far:
When did Joe Raposo appear on SS?
during the early 1970s.
how many time did he appear?
16 mm film.
Why did he leave?
" - various versions of which have opened every episode - as well as many of its most popular songs.
Are there any other interesting aspects about this article?
Cookie Monster on television for Sesame Street.
What did he do with cookie monster?
Raposo was actually the first puppeteer to operate Cookie Monster on television for Sesame Street.

Question: How long did he protray cookie monster?
Self-contained rewrite: How long did Joe Raposo protray cookie monster?