Sloane Mark Harmon News Today

Is Mark Harmon leaving NCIS? CBS president addresses question Tue May 25, 2021 at 2:18pm ET Mark Harmon has starred as Agent Gibbs for 18-straight seasons of NCIS. Pic credit: CBS Mark Harmon leaving NCIS would definitely take the show in a direction that many viewers might not be interested in. For 18 years of the hit CBS drama, Mark Harmon has starred as Special Agent Leroy Jethro Gibbs. Not only has Harmon remained the star of the show, but his character continues to be the glue that holds e...