According to his son Bradford, in an introduction written for the 2004 book The Lost Classics of Jack O'Connor, O'Connor wrote more than 1200 articles for hunting and fishing magazines, and also wrote romantic novellas and articles for Redbook, Mademoiselle, Reader's Digest, Cosmopolitan, Esquire, the literary magazine Midland, and other magazines popular in the 1930s and 1940s.