Gregory is an award-winning screenwriter and producer. He wrote the treatment and co-produced the blockbuster feature film Hacksaw Ridge, directed by Mel Gibson, nominated for six Academy Awards including best picture. He was raised in Beverly Hills, California, studied law, then formed a production company with his lifelong friend, Desi Arnaz, Jr., eventually becoming VP of Production for Sandy Howard Productions -- the film company that produced the highly acclaimed Richard Harris movie A Man Called Horse. He's a member of the Writer's Guild of America (WGA) and has written and developed projects for a variety of Hollywood notables including the legendary Lucille Ball, Dale Pollock, Mel Gibson, Donald Petrie, Martha Coolidge, 20th Century-Fox, Columbia Pictures, MGM, Permut Presentations, and Hallmark Entertainment. His new book, "The Birth of Hacksaw Ridge -- How It All Began," copyright 2018, is the prequel to the movie Hacksaw Ridge and the only authorized book ever written on the early years of Desmond Doss.