Thomas "Tom" Morrow was the former NCIS Director, a position he held during Ice Queen (episode) and Meltdown (episode) and also Season One and Season Two up until his resignation from NCIS for good which occurred during the Season 3 premiere episode, Kill Ari Part 1 (episode).
Following Morrow's resignation from NCIS to become deputy director at Homeland Security, he was replaced by Jennifer Shepard and in the aftermath of Shepard's death in the Season 5 finale episode, Judgment Day Part 1 (episode), Leon Vance became the NCIS Director.
Despite having moved on from NCIS, Morrow has in recent years been in involved in various investigations with NCIS that have brought him back into contact with his former NCIS colleagues, particularly NCIS Special Agent Leroy Jethro Gibbs.
Much of Morrow's life is unknown but it's presumed that he joined NIS/NCIS as an agent and began working various cases during his career before retiring and ultimately becoming NCIS Director.
JAG Season 8
Morrow made his debut appearance in the JAG Season 8 episode, Ice Queen (episode) where as the Director of NCIS, he oversaw the eventual capture of wanted terrorist, Amad Bin Atwad, even going so far to invite the NCIS Major Case Response Team led by Special Agent Leroy Jethro Gibbs to witness Bin Atwad's capture.
A while after Bin Atwad's capture, Morrow later tasked Gibbs with interrogating Bin Atwad despite the fact that Gibbs was in charge of the case concerning the murder of former JAG officer, Lieutenant Loren Singer.
In Meltdown (episode), the second and final part of the JAG Season 8/NCIS backdoor pilot episode, Morrow also personally saw the identification of Hussan Mohammed, the terrorist responsible for the attack on the USS Cole.
NCIS Season 1
Morrow was later seen in MTAC where he successfully outmatched the directors of both the Secret Service and the FBI in order to ensure that NCIS still had full control of the investigation into a Navy Commander's death on Air Force One. He also told the Directors that they all believed that they had the best people for the job and that they wouldn't be agency directors if they didn't.
In Seadog (episode), Morrow even convinced Charlie the Director of the Federal Bureau of Investigation to give him full access to the FBI terrorist database, causing Tobias Fornell to remark that he now knows where the cowboys (NCIS) get their chutzpah. Despite this, Morrow didn't pick up any kind of fight against the CIA and even told Gibbs to back down if it concerned a CIA operative like Ari Haswari.
In Dead Man Talking (episode), Morrow was revealed to have asked Gibbs to give an eulogy at Christopher Pacci's funeral but when Gibbs refused, Morrow did it instead and NCIS Special Agent Caitlin Todd was later seen saying that the Director had given a nice eulogy.
NCIS Season 2
NCIS Season 3
Morrow's two and a half year term ended when in the aftermath of Special Agent Caitlin Todd's murder at the hands of rogue agent, Ari Haswari, Morrow announced to Leroy Jethro Gibbs that he had been offered the position of Deputy Secretary of the Homeland Security and had accepted it, resulting in Morrow leaving NCIS.
Before resigning, Morrow gave Todd the Medal of Freedom and later revealed Gibbs's former girlfriend and partner, Jennifer Shepard was his replacement before departing from the agency for good.
NCIS Season 8
Morrow was mentioned in a talk between Gibbs and Leon Vance in the Season 8 episode, Enemies Foreign (episode) which revealed that as of 2010, Morrow was still alive.
NCIS Season 10
After an absence of eight years, Morrow later appeared in the Season 10 episode, Chasing Ghosts (episode) as a Senior Division Chief with Homeland Security and again in the episode, Revenge (episode).
NCIS Season 11
Morrow reappeared in the Season 11 premiere episode, Whiskey Tango Foxtrot (episode) where he attended a function where a bomb soon exploded, damaging the hotel and leaving many people dead or injured with SECNAV Clayton Jarvis being one of the fatalities.
Morrow survived but was left with an injured leg.
NCIS Season 12
A year later, Morrow appeared in the Season 12 episode, Blast from the Past (episode), assisting Gibbs with an old case that had started while Morrow was the Director of NCIS or NIS.
Morrow is a tall man in his late fifties/early sixties with thin white hair and blue eyes.
He is often seen wearing suits.
As a former Director of NCIS, Morrow is an expert at playing politics and essentially smoothing things over with Directors with other agencies including the FBI and CIA.
Morrow is skilled in interrogation.
Leroy Jethro Gibbs
Morrow and Gibbs had a close relationship with one another so much so that Gibbs even called Morrow "sir" on several occasions.
In the Season 2 finale episode, Twilight (episode), when Gibbs was under threat from Ari, Morrow put Kate in charge of being Gibbs's protection detail, hinting that Morrow had strong confidence in Kate's skills and due to the fact that she had previously run protection details with the United States Secret Service before joining NCIS.