Star of screen, television, and stage, Mark Harmon is now taking on the publishing world with Ghosts of Honolulu. Probably most recognized for his role as Leroy Jethro Gibbs on the hit drama NCIS, which he led for 18 seasons, Harmon is also an executive producer on the show. In his other TV work, Harmonreceived an Emmy nomination for Outstanding Guest Actor in a Drama Series for the critically acclaimed The West Wing. Previously he earned an Emmy nomination for Outstanding Supporting Actor in a Drama Special for Eleanor and Franklin: The White House Years. He received two consecutive Golden Globe nominations for his work on Reasonable Doubts, and received two additional Golden Globe nominations for Best Performance by an Actor in a Motion Picture Made for TV; one for After the Promise, and another for his role as notorious serial killer Ted Bundy in The Deliberate Stranger. Along with his costars on Chicago Hope, he received two Best Ensemble SAG Award nominations. Further credits include HBO's From Earth to the Moon, St. Elsewhere, Moonlighting, and Tennessee Williams' Sweet Bird of Youth.

Harmon made his feature film debut in Alan Pakula's Comes a Horseman. Additional credits include Lawrence Kasdan's Wyatt Earp, Stealing Home with Jodie Foster, The Presidio, and Carl Reiner's smash hit, Summer School. On stage, Harmon has appeared in Kevin Wade's Key Exchange, Bill C. Davis's Wrestlers, and Mark Medoff's The Wager. In addition, he has done several successful productions of A. R. Gurney's hit play Love Letters with his wife, actress Pam Dawber.

Born and raised in Southern California, Harmon excelled in sports. He quarterbacked UCLA to multiple winning football seasons and was presented the National Collegiate Football Foundation Award for All Around Excellence. The National Football Foundation recently bestowed Harmon with their highest honor, the Gold Medal, making him the first recipient in their organization to receive both the Scholar Athlete Award and the Gold Medal. He is a cum laude graduate with a degree in communications.

Leon Carroll Jr. is the technical advisor on the hit drama NCIS. A native of Chicago, Illinois, he attended Lindblom Technical High School and went on to earn a BS degree in business economics from North Dakota State University. He was a member of two College Division national championship teams in the late 60s. Leon was a commissioned officer in the United States Marine Corps, serving on active duty for 6 years and 3 years in the Marine Corps Reserves, attaining the rank of Major. His duty assignments included serving in the Fleet Marine Forces and Sea Duty onboard the USS Ogden (LPD-5). Following his stint in the Marine Corps, Leon began a 20-year career as a Special Agent with the Naval Criminal Investigative Service (NCIS). He served in 7 different locations, including tours as a Special Agent Afloat on the USS Ranger (CV-61) and as the Special Agent in Charge of NCIS offices in the Republic of Panama and the Pacific Northwest. Upon retirement from NCIS, Leon was selected to be the technical advisor for the top-rated drama of the same name, holding that position for 20 seasons. His experience in Foreign Counterintelligence gives him unique insight into the world in which undercover agents operate.