|Real Name||Jemma Simmons|
|Alias(es)||Fitz-Simmons (with Leo Fitz)|
|Date of Birth||September 11, 1987|
|Ser. No.||A 0956307|
|Title(s)|| Agent of S.H.I.E.L.D.|
|TV series||Agents of S.H.I.E.L.D.|
|Portrayed by||Elizabeth Henstridge|
- "Simmons is probably smarter, technically. But that’s because she likes homework more than life itself."
- ―Leo Fitz about Jemma Simmons to Donnie Gill[src]
Jemma Simmons is a genius bio-chemist and a rising star in S.H.I.E.L.D.’s research division, along with her inseparable friend and partner, Leo Fitz. The two are usually found bickering, but they are always found together. Simmons has a love for science and a wide-eyed enthusiasm for the world that make this opportunity to work in the field the adventure of a lifetime.
A bio-chem genius with two PHD's, Jemma Simmons attended the S.H.I.E.L.D. Academy of Science and Technology with her best friend, engineering genius Leo Fitz. Among their instructors were Professor Vaughn and Professor Hall, who taught chemical kinetics during their second year..
Simmons and Fitz graduated from the academy three years early. Wanting to see more than the inside of a lab, and against the advice of Professor Vaughn, Simmons convinced Fitz to seek out a field assignment.
Simmons and Fitz were recruited by agent Phil Coulson to be the science crew for a new team he was putting together. Stationed on the Bus, the pair have designed specialized equipment and compounds on the fly in various emergency situations.
Their first foray into the field involved the case of Michael Peterson, a man in danger of exploding due to his use of the volatile Centipede formula. Peterson was saved in part by Simmons' efforts to create a Centipede counter-agent for Peterson. 
Simmons first faced danger in the field in Peru, where the team was investigating an 0-8-4. Simmons and the team escaped Peruvian rebels only to face an armed takeover of the Bus. Working with the team, she helped take back the Bus and secure the old HYDRA weapon. 
While investigating a mysterious death in Pennsylvania, Simmons was infected with a lethal alien virus passed along from a Chitauri Helmet. After what appeared to be a final failed attempt at a cure, Simmons threw herself from the Bus in flight in order save her team from the virus' effect. Fortunately for Simmons, the cure was actually effective and teammate Grant Ward caught her in mid-flight and parachuted them both to safety.
Jemma Simmons is known as the attractive nerd and also a science buff on her profile for S.H.I.E.L.D.
- Night-Night Gun
- D.W.A.R.F. Drones
- Full-Spectrum Goggles
- Backscatter Glasses
- Magic Window
- Anti-Serum Delivery Mechanism
- Golden Retrievers
- Tactical Suit
- Night-Night Bracelet
- Atmospheric Moisture Freezing Device
- Coulson's Team
- S.H.I.E.L.D. Academy
- Michael Peterson - Ally
- Elliot Randolph - Ally
- Camilla Reyes - Enemy
- Carlo Mancini - Enemy
- The relationship between Fitz and Simmons is based on the relationship between Jed Whedon and Maurissa Tancharoen.