Jeff Clarke was a Fire Lieutenant at Firehouse 25 and a former member of Firehouse 51. He got injured on the job so decided to enroll in med school. He is introduced as a 4th year medical student during Chicago Med's season 1 finale.
Following the closure of his firehouse (Firehouse 33) during Gail McLeod's reorganization of the department, Clarke was reassigned to Firehouse 51 and put on Rescue Squad 3. Originally, he was believed to be the spy who was informing McLeod on Firehouse 51 due to his private demeanor and his refusal to deny the claims. However, it was later revealed that he was not the snitch. Since then, he has been fully accepted as a member of the firehouse.
Clarke is an former Marine and decides to reconnect with his wife following his move to Firehouse 51. However, he discovers that she has been having a relationship with another man who, now Clarke is reunited with his wife wants repayment of the money he lent her during their relationship. In the episode Shoved In My Face the threats continue until it is discovered that the man has been shot and killed with a military gun similar to Clarke's. He is originally considered a prime suspect and suspended whilst the case against him is mounted. Finally after much encouragement Clarke admits that he is covering for his wife who actually shot her ex-boyfriend after discovering he was dating other women. All of the charges are dropped against Clarke and he splits from his wife.
Following the blackout in the episode Tonight's The Night, Clarke is sent by Cruz to get meat and beans from a local shop however the shop is attacked by thugs who stab the owner and Clarke manages to scare them off with a baseball bat. Clarke applies pressure and antiseptic to the wound and manages to save the life of the man until the thugs reappear with back-up, they threaten Clarke who defends himself with a baseball bat. However, he is rescued by the police who scare away the thugs. Later, following the kidnap of Katie, Clarke agrees to help Severide get vengeance on Vince despite his previous legal troubles.
Mills was the first acquaintance of Clarke's in Firehouse 51. He was also the one who cleared Clarke's name as the Mole. Their friendship then continues to develop, and there are many occasions it is exhibited, such as when Mills goes to Clarke's house to convince him to turn Lisa in in Shoved In My Face.
|Season 2 Appearances|
|"A Problem House"||"Prove It"||"Defcon 1"||"A Nuisance Call"||"A Power Move"|
|"Joyriding"||"No Regrets"||"Rhymes With Shout"||"You Will Hurt Him"||"Not Like This"|
|"Shoved In My Face"||"Out With A Bang"||"Tonight's The Night"||"Virgin Skin"||"Keep Your Mouth Shut"|
|"A Rocket Blasting Off"||"When Things Got Rough"||"Until Your Feet Leave the Ground"||"A Heavy Weight"||"A Dark Day"|
|"One More Shot"||"Real Never Waits"|
- According to Peter Mills, Jeff served in the 1st Battalion 8th Marines during the Battle of Fallujah.