“NCIS” fans may be interested in learning about the real Leroy Jethro Gibbs and reading Mark Harmon's biography. Mark Harmon has been on the television screen for years, but he has been mostly recently seen on “NCIS.” Mark Harmon has been married to Pam Dawber since 1987 and has two sons. This is probably one of the longest celebrity marriages on record today.

Mark Harmon's first big televisions roles were Fielding Carlyle on “Flamingo Road” in the early '80s; Dr. Robert Caldwell on “St. Elsewhere” in the mid-'80s; Detective Dicky Cobb on “Reasonable Doubts” in the early '90s and Dr. Jack McNeil on “Chicago Hope” in the late '90s. He has been on other television shows for anywhere from one episode to a dozen. However, before he appeared on television he played college football, following in his father's footsteps.

Harmon's father was sports broadcaster Tom Harmon and his mother was former actress Elyse Knox. He has two sisters, Kelly and Kristin. Kristin is a mother to musicians Gunnar and Matthew Nelson and to actress Tracy Nelson. Before making it on television, Harmon as a roofer and performed in theater productions at night. Before meeting his wife, Harmon had relationships with Cristina Raines and Heather Locklear.

Mark Harmon has appeared on various talk shows over the years. These talk shows include “The Tonight show with Jay Leno,” “The Late Late show with Craig Ferguson,” “Entertainment Tonight,” “The Today Show” and “The Rosie O'Donnell Show” just to name a few of the various appearances he has made over his acting career.