Jeff Clarke
Full Name
Jeff Clarke
Former U.S. Marine
Former Chicago Firefighter Lieutenant
1st year Resident in Emergency Medicine in Maui, Hawaii
Marital Status
Lisa (Ex-Wife)
Natalie Manning (Ex-Girlfriend)
Peter Mills (Friend)
Kelly Severide (Friend)
Christopher Herrmann (Friend)
1, 2
First seen
Last seen
"White Butterflies"
Appeared in
16 episodes (see below)
Portrayed by
Jeff Hephner


Jeffrey "Jeff" Clarke is a former U.S. Marine and Firefighter/Lieutenant from Firehouse 25. He first appeared on Chicago Fire.

After injuring his back on the firefighting job, Jeff enrolled into medical school. He has completed his internship at Gaffney Chicago Medical Center and currently is working in Emergency Medicine at a Emergency Department in Maui, Hawaii. His first appearance is in the season one finale "Timing".

To read more about his firefighter career, visit his Chicago Fire wiki page here.

Season 1

Jeff appears in the season one finale as one of the new medical students in the E.D. He is revealed to have been friends with Natalie Manning and her late husband, also named Jeff. He was Jeffrey Manning's best friend.

Season 2

In the season two premiere, Jeff is shown to be eager to get involved with E.D cases. However, he is frustrated by the fact that Will Halstead will not allow him to take the lead. The two argue after Jeff performs a procedure on a patient without consent from a doctor, which is against hospital policy. It is hinted that the animosity between the two may stem from their mutual attraction to Natalie. At the end of the episode, Jeff and Natalie leave Molly's and go back to his apartment together.

It is revealed in 2x02 that Jeff and Natalie's husband served together in the U.S. Marine Corp. During this episode, Jeff assists Dr. Choi with patients affected by gang violence. He and Natalie spend the night together again.

In 2x04 Jeff and Natalie drive to work together but leave the car separately to try and keep their relationship secret, although Will tells Natalie that everybody from the E.D staff to "the crazy guy out front who thinks he's Jesus" already knows.


Season 1 Appearances
"Derailed" "iNo" "Fallback" "Mistaken" "Malignant"
"Bound" "Saints" "Reunion" "Choices" "Clarity"
"Intervention" "Guilty" "Us" "Hearts" "Inheritance"
"Disorder" "Withdrawal" "Timing"

Season 2 Appearances
"Soul Care"

"Win Loss"

"Natural History"

"Brother's Keeper"

"Extreme Measures"

"Alternative Medicine" "Inherent Bias" "Free Will"

"Uncharted Territory" "Heart Matters"
"Graveyard Shift" "Mirror Mirror" "Theseus' Ship" "Cold Front" "Lose Yourself"
"Prisoner's Dilemma" "Monday Mourning" "Lesson Learned" "Ctrl Alt" "Generation Gap"
"Deliver Us" "White Butterflies" "Love Hurts"