Fox moved to Hollywood, California and became the executive vice president of Universal Pictures and board chairman of United World Films.[1] In 1942, following the attack on Pearl Harbor, he left his role as vice president of Universal Pictures to serve the United States government.[2] Fox joined the War Production Planning Commission and took charge of collecting scrap metal, old tires, and other discarded materials needed by defense industries.[2] Fox later enlisted in the United States Army as a private and, by the end of World War II, was promoted to the rank of major.[2]
Fox went back into business and was president of Skiatron of America, a company that introduced pay television in the United States.[1] In 1948, Fox formed the international trade organization American-Indonesian Corporation. His company was terminated by the Indonesian government the following year, after Dutch rule ended, and he received a settlement of $550,000.[1] Because of his role in Indonesian trade, he was nicknamed the "economic godfather of Indonesia".[2]
At the time of his death in 1964, Fox was serving as board chairman of TV Productions, a subsidiary of Subscription Television, Inc., and president of Motion Pictures for Television, Inc.[2]
On June 2, 1964, Fox died from a heart attack at his Park Avenue home.[2] A funeral service was held on June 3, 1964, at Riverside Memorial Chapel on the Upper West Side.[2] A graveside service conducted by Rabbi Hyman Cohen of Beth-Israel Sinai Temple was held on June 4, 1964, in Racine.[1]