[3] In 1937 he was one of three writers who expanded an unpublished Damon Runyon story which was turned into the screenplay for Racing Lady, which starred Ann Dvorak, Smith Ballew, and Harry Carey.
[4] Bren was one of the writers of the screenplay for The Man Who Found Himself, also in 1937, featuring Joan Fontaine in her first starring role, along with John Beal.
[7] To open the film, Bren secured the rights to a tape of Japan's prime minister, Kuniaki Koiso, in which he exhorts the Japanese population to "sacrifice everything to repulse the enemy.
[12] The 1954 film, Naked Alibi, directed by Jerry Hopper and starring Sterling Hayden and Gloria Grahame, was based on a story by Bren and his long-time writing partner, Gladys Atwater.
[13] Bren's last big screen writing credit was again as story co-writer with Atwater for The Treasure of Pancho Villa, directed by George Sherman, and starring Rory Calhoun, Shelley Winters and Gilbert Roland.