Founded public relations agency Clein + Feldman in 1981 with Bruce Feldman. When Feldman left in 1989 and Cara White joined the firm, the name was changed to Clein + White.
Received the 2000 Publicists Guild Career Achievement Award for his work on The Blair Witch Project.
Began his professional career as a page at NBC in New York.
When Clein relocated to Los Angeles, he worked for a detective agency posing as an employee at Disneyland one summer.
Began he media career working for LA gossip columnist Joyce Haber.