Art Mullen is the Chief Deputy of Lexington US Marshals Field Office in Lexington, Kentucky. He is portrayed by starring cast member Nick Searcy.
A native of Harlan County, he met another former resident, Raylan Givens, who was also an instructor at the US Marshal's Academy at Glynco, Georgia.
He takes a lax attitude towards Raylan Given's unusual method of law enforcement thinking that in time, either Raylan leaves Harlan County for good or becomes another US Marshal killed in the line of duty.
In "Where's Waldo?", he is seen talking to a US Marshal named Patrick Massett, who is interested in succeeding Art when he retires. Art, realizing the man's true interest, gives him a quick analysis of Tim, Rachel, and Raylan. Art excuses himself, saying that he has to inform Raylan that his father, who killed a cop has now killed a prison inmate. Art informs Raylan, who mentions that the murder probably had something to do with the bag he found in the wall, and confides the information to Art. Art, Tim, and Raylan leave and stake out the Truth residence, where they give chase after the Truth's grandson Milo, after they spot him checking the mail. In the house, they learn that the man posing as Waldo Truth is really an imposter named Harold Shawn, who has posed as Waldo for 15 years to provide the Truth family with disability checks. Mother Truth mentions that Waldo left with a pilot named Drew Thompson, but never returned. Art suddenly wants to leave after hearing Drew's name. Art explains to Raylan and Tim how Drew, the pilot, once parachuted into a local neighborhood and brought cocaine with him. Yet new evidence—a scar on the body consistent with one that Waldo received from his loving wife—points to the body found in the neighborhood as belonging to Waldo. So all these years Drew has been presumed dead, but it was Waldo all along. So where's Drew? "I don't know, but I bet your daddy knows," Art tells Raylan.
In "Kin", he is seen standing along with David Vasquez when FBI Agent Jeremy Barkley enters, angered at the Marshals for taking over the Drew Thompson case. Art tells him that they petitioned the Department of Justice in order to do so.
In "Money Trap", he talks to Raylan and tells him to offer Arlo a deal to find Drew Thompson, much to Raylan's chagrin. Later, he calls Raylan while he is with Jackie, and has suspicions of her being a new love interest for him.
In "Outlaw", he informs Raylan of Arlo's stabbing. Later, upon learning of Arlo's death from Raylan, tries to give Raylan a week off. Raylan argues against this and Art negotiates with him, giving him two days off.
In "Get Drew", Art shows up at the roadblock and objects to Raylan wanting to inform the state troopers after they realize that Ellen May is with Shelby. Art would rather the Marshals catch someone who is a huge badass like Shelby than allow the state troopers to do so. Later, Art is seen with Tim, Raylan, and Rachel when they drive to the abandoned field after being tipped off by Johnny Crowder.
In "Decoy", Art and Tim (along with Nelson Dunlop--masquerading as Raylan Givens--and the KSP Officers) drive to the meeting place along the highway. Tim, who notices two abandoned cars parked too closely to one another and soon a third, becomes suspicious of a set up and stops the cruiser. Tim then drives around, parking besides the KSP truck to avoid moving around the bombs. Later, they arrive at the high school where they learn from Bob Sweeney that Shelby has escaped Harlan by means of a coal train.
In "Peace of Mind", Art and Raylan learn that Shelby refuses to go through with his deal for WitSec until he knows for sure that Ellen May will be safe and protected as well. Art still shows interest in suspending Raylan, but Raylan argues that he wants to finish what he started and wants to look for Ellen May. Art reluctantly agrees under the condition that Raylan takes Tim and Rachel with him.
In "Ghosts" Art shows up at Raylan's house after the shooting and tells Raylan that he can't work the case because it is too personal for him, and warns Raylan not to bother coming back to the Marshals office if he goes over Nick Augustine himself. Later, he calls Raylan to inform him that Sammy Tonin is the new head of the Detroit mob, and that Augustine was killed in a mob-style execution.
- Leslie Mullen: Wife
- Raylan Givens: Longtime Friend and Subordinate
- Tim Gutterson: Subordinate
- Rachel Brooks: Subordinate
- "Do you dumb ass peckerwoods understand english? On the ground hillbillies! Now!" - Yelled from a bullhorn as the Marshalls raid Bennet Family compound in "Bloody Harlan"
- (To Raylan) " Next time you say you're not good at something I'm going to believe you." in "Guy Walks Into a Bar"
- "Well he's a bank robber Raylan, why would he lie to me?" in "Save My Love"
- "Well then you look like you are some drunk who is looking for some car keys under a street lamp cuz that's where the lights is" in "The lord of war and thunder"
|Season one appearances|
|Fire in the Hole||Riverbrook||Fixer||Long in the Tooth||The Lord of War and Thunder|
|The Collection||Blind Spot||Blowback||Hatless||The Hammer|
|Veterans||Fathers and Sons||Bulletville|
|Season two appearances|
|The Moonshine War||The Life Inside||The I of the Storm||For Blood or Money||Cottonmouth|
|Blaze of Glory||Save My Love||The Spoil||Brother's Keeper||Debts and Accounts|
|Full Commitment||Reckoning||Bloody Harlan|
|Season three appearances|
|The Gunfighter||Cut Ties||Harlan Roulette||The Devil You Know||Thick as Mud|
|When the Guns Come Out||The Man Behind The Curtain||Watching the Detectives||Loose Ends||Guy Walks Into a Bar|
|Season four appearances|
|Hole in the Wall||Where's Waldo?||Truth and Consequences||This Bird Has Flown||Kin|
|Foot Chase||Money Trap||Outlaw||The Hatchet Tour||Get Drew|
|Decoy||Peace of Mind||Ghosts|