David McCallum

First gaining recognition in the ’60s for “The Man from UNCLE, David McCallum was already a veteran performer when he took on the role of medical examiner Ducky Mallard on “NCIS.” The three-time Emmy nominee has played the part since 2003, with his name continuing to appear in the show’s credits in its 19th season in 2021.

It’s also worth noting that McCallum has made appearances in the spin-off “NCIS: New Orleans” and even lent his voice for the “NCIS” video game. Speaking of his voice acting work, you might also recognize him as Professor Paradox from the “Ben 10” animated show franchise.