Returning to the United States from his early travels in the Far East in 1929, Mr. Hubbard studied at George Washington University where he became president of the Flying Club and secretary of the Engineering Society, and wrote articles, stories and a prize-winning play for the school's newspaper and literary magazine.

A daredevil pilot, he barnstormed across the United States in gliders and early powered aircraft, becoming a correspondent and photographer for the Sportsman Pilot, one of the most important national aviation magazines of its day. Then, at the age of twenty-five, with his reputation as a writer of popular fiction already prominently established, he was elected president of the New York Chapter of the American Fiction Guild, whose membership at the time included Dashiell Hammett, Raymond Chandler and Edgar Rice Burroughs. He subsequently also worked in Hollywood, writing the story and script for Columbia's 1937 box-office hit serial The Secret of Treasure Island, and as a screenwriter and script consultant on numerous films for Columbia, Universal and other studios.