Jeffry P. Freundlich, primarily known by his pen name Jeff Lindsay, is an American playwright and crime novelist. He was born on July 14, 1952. He is best known for his novels about the fictional sociopathic police forensic analyst and vigilante serial killer Dexter Morgan. The first book of the series was later developed into the Showtime television series Dexter with actor Michael C. Hall playing the character.

Jeff Lindsay lives in Florida with his wife, author Hilary Hemingway, daughter of Leicester Hemingway, who is the brother of the famous writer Ernest Hemingway. Jeff graduated from Middlebury College, Vermont, in 1975, and from Celebration Mime Theatre's Clown School the same year. He received a double MFA, in Directing and Playwriting, from Carnegie-Mellon University, and has written 25 produced plays. He has also worked as a musician, singer, comedian, actor, TV host, improv actor, and dishwasher.