Warren is married to love of his life Karen Hauser since a long time. His wife Karen Hauser is the creator of the Internet Broadway Database (IBDB.com). She is also known for being the Research Director for the Broadway League. His nationality is American and he is of Russian ethnicity.
At his young age, Warren had financial troubles as he was raised in the humble background. His father Don Leight was involved in music and he worked with the musicians like Claude Thornhill, Woody Herman and Buddy Rich. Warren was raised in Queens and the Upper West Side of Manhattan. There he completed his high school graduation and then he joined Stanford University. There he majored in communication. He finally earned his Bachelor of Science degree from there in 1977. Initially he dreamed to be a journalist but he began his career as a screenwriter in 1980 by writing the script of an American horror film Mother's Day. In 1982, he wrote Stuck on You! and Before the Nickelodeon: The Cinema of Edwin S. Porter. He is also known for being the writer of the movies and TV series like Me and Him, 100 Centre Street, The Night We Never Met and so on. He is also a director; he began his directorial career in 1993 by directing an American romantic comedy film The Night We Never Met. He got his rise in fame as a producer after he produced an American police procedural television drama series Law & Order: Criminal Intent. He also worked as its Co-Executive Producer, & Executive Producer/Showrunner. His net worth is high.