His stepson Jamie Katz confirmed the death.
Mr. Lieber had already had a substantial career as a publicist and journalist when, in September 1965, he organized the first Jazz at Noon, partly to give himself a chance to play his alto saxophone and penny whistle for an audience. It was on a Monday at lunch hour at Chuck’s Composite, a restaurant on East 53rd Street.
“I was dying on the vine as a musician,” he told The New York Times in 1975, recalling the origin of the sessions. “I hadn’t had my sax out of its case in eight years. I felt there must be others like me who would love to play but couldn’t get a rhythm section together without disrupting their families.”
The experiment soon had a following, as players who might have once had thoughts of a professional career but had become doctors, lawyers or accountants pulled instruments out of closets. Soon Mr. Lieber added to the allure by recruiting professionals, for a modest fee, to drop in as guest stars.