I am cyber friends with prolific writer Michael B. Druxman. He has had such an interesting career that began in 1960s Hollywood running his own entertainment public relations business. He began writing professionally in the 1970s, starting with books about movies (Make It Again, Sam: A Survey of Movie Remakes was a teenage fave of mine) and movie stars, and then graduated to stage plays, screenplays and novels. Check out his credits on the IMDB.
He has way too many books to promote, but two that stand out for me, and are on my reading list, are his well-received memoir My Forty-Five Years in Hollywood and How I Escaped Alive and his published screenplay Matricide loosely based on the murder of former Fifties starlet Susan Cabot by her son. Below is video promotion for it: