[3] Gross had remained friendly with Guber, and together with Frank Ford they established the Valley Forge Music Fair in Devon, Pennsylvania in 1955, initially in a circus tent and later replaced by a permanent structure with 2,900 seats built in theater in the round style.
[1][5] Among the stars who performed at their suburban theaters were Tony Bennett, Jack Benny, Milton Berle, Ray Charles, Bill Cosby, Sammy Davis Jr., Judy Garland, Bob Hope, Liza Minnelli, Don Rickles, Smokey Robinson, Kenny Rogers, Frank Sinatra, Bruce Springsteen and Stevie Wonder.
The pair ran a concert division that arranged performances nationwide, including traveling productions of Broadway theater hits such as Cabaret, Fiddler on the Roof, Gypsy and Man of La Mancha.
They also produced theatrical revivals on Broadway, such as a year-long run of Lorelei in 1974 with Carol Channing, and a Yul Brenner-led production of The King and I that debuted in 1977 and ran for nearly 700 performances.
[2] His 1978 book Havana X was about a CIA plot to assassinate Fidel Castro by taking out a Mafia contract at a cost of two million dollars on the Cuban leader, and was described in a brief review in The New York Times (to paraphrase) as an action-filled manhunt with a somewhat contrived ending, noting that he "writes well and has a cynical view of the men who run the world.