Mark Harmon Reveals the Huge Compliment Paid to Austin Stowell After His 'NCIS: Origins' Audition!

Mark Harmon ‘There to Help’ Behind Camera as 'NCIS' Prequel Producer

Mark Harmon Explains Why His Son Sean Isn't Playing Young Gibbs in 'NCIS: Origins' Series

Mark Harmon on Returning to ‘NCIS: Origins’ After Choosing to Leave Franchise — and Why His Son Isn’t Portraying Young Gibbs in Prequel