In a talk with Leon Vance, the NCIS Director, Jarvis told him that upon being offered the SECNAV position by the President, Jarvis had originally assumed that it was a trick.
Jarvis's first order of business within mere minutes of being appointed as SECNAV was to have the Major Case Response Team's second-in-commad, Special Agent Anthony DiNozzo track a mole within NCIS with the mole later being revealed as Simon Cade in the following episode, Nature of the Beast (episode), although the same episode also revealed that Cade was actually framed which also meant that while Jarvis had acted, believing that he was operating for the good, it was also revealed that Sean Latham and Latham's second-in-command, Jonathan Cole were both manipulating Jarvis into believing that Cade was guilty to presumably draw attention away from themselves.
Jarvis then appeared in Safe Harbor (episode) when dealing with a family from Lebanon who were seeking political asylum.
He also appeared in Engaged Part 1 (episode) where he and Leon Vance at the end of the episode told Gibbs to have him and his team bring back a missing marine. Jarvis was also present in MTAC in Engaged Part 2 (episode) during Lieutenant Hernandez's rescue alongside DiNozzo and Timothy McGee.
Jarvis returned once more for the Season 9 episode, Housekeeping (episode) when EJ Barret's whereabouts became known and was left stunned when Leroy Jethro Gibbs revealed that Jarvis's friend, Latham and Jonathan Cole were the ones who had directly manipulated Jarvis while Cole was revealed to be the person responsible for killing Cade and injuring EJ and DiNozzo. Jarvis later aided the Major Case Response Team in helping them capture Cole by feeding false information to Latham who Cole later murdered to protect the mission and as a result, Cole was later found and finally arrested although he murdered Latham in the process.
In the Season 9 episode, The Tell (episode), Jarvis faked an assassination attempt in order to solve some embezzlement issues with a naval steel company.
Jarvis was present multiple times during the investigation regarding terrorist Harper Dearing and was seen talking to Agent Gibbs in the Season 10 premiere episode, Extreme Prejudice (episode). He first arrived on scene to the ruins of the Navy Yard mere hours after the bombing had occurred and later informed Gibbs, Vance and FBI Agent Tobias Fornell that all agencies were to locate Dearing and proceed with extreme prejudice which hints President Barack Obama had given them strict orders to kill Dearing.
Jarvis again appeared in the Season 10 episode, Shiva (episode) where he was in Vance's office, berating Leroy Jethro Gibbs for not telling him that Eli David, Agent Ziva David's father had arrived in the U.S. He later attempted to offer some comfort to Vance who had just lost his wife in a drive-by shooting. He later gave NCIS Deputy Director Jerome Craig powers or rather orders to become the Acting Director of NCIS, replacing Vance who was put on administrative leave after angrily confronting a suspect during the investigation and thus nearly exposed prematurely that Eli David was killed (NCIS had earlier been ordered to keep the events of Eli's death under wraps within 48 hours by President Obama in order to prevent a full-scale war occurring between Israel and Iran).
Jarvis's final appearance came in the Season 11 premiere episode, Whiskey Tango Foxtrot (episode) where it was revealed that he was the single fatality in a hotel bomb.
His death left Vance, Gibbs and the entire NCIS agency stunned while Vance took Jarvis's death pretty hard due to the fact that Vance and Jarvis had been friends.
A politician at best, Jarvis was a narcissist who seemed to believe that he is number one in everyone's eyes regardless of what anyone thinks. On one such occasion, Jarvis stated to DiNozzo that he owned him, hinting that Jarvis seemingly believed that he wa DiNozzo's boss although Gibbs actually is.
Unsurprisingly, Jarvis had little or no patience for Gibbs and even ignored his concerns about DiNozzo although in the Season 9 episode, Housekeeping (episode), when Gibbs confronted him with the damning evidence about Sean Latham and Jonathan Cole along with the news that the two men were part of Phantom Eight, Jarvis seemed stunned and taken aback.
He also displayed a compassionate side during "Shiva" when he attempted to offer some comfort to Vance.
- He was seen wearing a wedding ring in Extreme Prejudice (episode) which confirms that he is married and in Whiskey Tango Foxtrot (episode), it was confirmed that he had children.
- Jarvis is played by Matt Craven, a Canadian actor who also originally worked alongside Rocky Carroll (Leon Vance) in the movie, "Crimson Tide".
- In addition, Craven is also the first-ever Canadian actor to play the SECNAV role in NCIS.
- Jarvis is also the first SECNAV in the NCIS series to have been killed in the line of duty as all his fellow predecessors presumably retired or either resigned from their position as SECNAV.