After beginning his career as a print journalist, first in Britain and then in the United States, he became best known for hosting the television series Lifestyles of the Rich and Famous from 1984 to 1995.

He wrote for several American newspapers, including New York Daily News, People and Ladies' Home Journal, before launching GO Magazine in 1967[3] and then became show business editor of The Star.

Leach got his start in television as a regular contributor to AM Los Angeles, with Regis Philbin and Sarah Purcell on KABC-TV.

On 10 February 1995, Leach played himself in a special appearance on the American family sitcom Boy Meets World in Season 2, episode 17 entitled "On the Air".

In the episode, he appears to present Eric Matthews with a check for $10 million; however, the delivery is a misunderstanding as it is actually intended for his neighbor, Dorothy Muldoon.

[10] He also served as the public address announcer for the 2010 NASCAR Sprint Cup race at Las Vegas Motor Speedway.

[13] Leach appeared in the 2006 documentary film Maxed Out, which chronicled the rise of the credit card industry in the United States and the concurrent increased personal debt among working-class people.