R. Scott Gemmill is a Canadian-American television writer and producer born in Fort Erie, Ontario Canada. He worked extensively on JAG and ER. Since its eighth season, he was the showrunner of NCIS: Los Angeles.
Gemmill worked on JAG as an executive story editor and writer. He joined the crew in the first season and remained until the fourth season, writing a total of 18 episodes. He was nominated for a Humanitas Prize in the 60-minute category for his work on the JAG episode Angels 30.
He joined the crew of ER in its sixth season as a supervising producer and regular writer. From Wikipedia