The Big Bang Theory

Alex Jensen

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Alex Jensen
Alex Jensen - profile
Research Assistant
Series Information
First episode
Portrayed by

Alex Jensen is a Caltech Physics doctoral student and Sheldon Cooper's assistant. Alex is often required to perform menial tasks for Sheldon, as opposed to assisting with his research. She often uses a very wide-eyed expression when having to deal with the gang's unconventional behavior. She displays a strong attraction for the initially oblivious Leonard, much to the chagrin of Penny and with interference from Sheldon.

Character InformationEdit


A native of Des Moines, Iowa, she graduated summa cum laude with a concentration in theoretical physics from Stanford University. Inspired by her father, a SETI astronomer, her dissertation concerns looking for Trojan asteroids at Earth's L5 Lagrange point. She gave up an opportunity at Fermilab to come work for Sheldon.


She is introduced in "The Higgs Boson Observation" (S06E03) when Sheldon hires her. Alex happens to be quite skilled with flattery, shown when she uses it to persuade Sheldon to hire her, even though immediately beforehand he insists that flattery does not work on him. When Leonard and Raj stop in to visit Sheldon, they meet Alex, whom Raj immediately falls for. Later, Alex meets Penny, who she mistakes for Leonard's assistant. Penny becomes jealous immediately after Alex says how talented he is and Penny takes Leonard off to the bedroom.


Alex flirting with Leonard.

Alex is next seen in "The 43 Peculiarity" (S06E08), where she shows an obvious interest in Leonard, though Leonard remains oblivious to her flirting and signals of attraction. She compliments him and tells him that girls must hit on him all the time. This attention is further explored in "The Egg Salad Equivalency" (S06E12) when Alex suggests that they could discuss the physics lecture she was attending over dinner. Her suggestion really startles Leonard. Although Leonard remains faithful to Penny, her offer does not stop his ego from inflating for the rest of the episode.

Sheldon, however, is jealous that she is showing any form of attention to any physicist besides himself, and attempts to discourage her advances and keep her focused on his needs. His efforts backfire spectacularly when she takes offense to his numerous condescending and demeaning remarks about women and their biological urges, causing her to file a sexual harassment complaint with a Human Resources administrator. The HRA's attempts to show Sheldon that his actions were offensive seem initially successful, with Sheldon later revealing to Alex that he is required to complete an online sexual harassment seminar; however, as he unaffectedly deems his time far too valuable, he asks Alex to take it in his place.


Alex asking Leonard out to dinner.

Alex Jensen next appears in "The Tangible Affection Proof" (S06E16). With Valentine's Day approaching, Sheldon has Alex buy his gift for Amy. Sheldon gives Alex two thousand dollars in various crumpled bills that he finds in his pockets and his desk, and instructs Alex on Amy's interests (monkeys and the color grey) so that Alex can find an appropriate gift for Amy. Alex buys a miniature harp music box that plays Amy's favorite song, a Canterbury Tales' map and a neuron cell drawing drawn and signed by famous neuroscientist Santiago Ramón y Cajal; all items purchased based on Amy's interests. Sheldon likes the drawing so much that he keeps it for himself.

Alex has made no appearances in season 7.


  • Sheldon's yogurt order.
  • Reviewing Sheldon's childhood notebooks.
  • Clowning in the ISS set
  • Alex Jensen
  • Taking Amy's message.
  • Alex talks to Howard and Raj.
  • Alex hits on Leonard to get him to take her out to dinner.
  • Well, everybody can't.
  • Penny meets Alex.
  • Alex hitting on Leonard.
  • Pretty sure.
  • You're cute and funny.
  • Alex hitting on Leonard.
  • Sheldon talking to Alex about Leonard.
  • Alex asking Leonard to dinner.
  • Alex Jensen wants an apology.
  • Alex shocked by Sheldon's photographs.
  • Please go buy me something for Amy.
  • Alex showing Sheldon the Valentines' Day gifts she bought for him for Amy.
  • Sheldon hands her a lot of cash to get Amy a Valentine's Day gift.

v · e · d
Characters, Cast & Crew
Characters Main Leonard Hofstadter  ‧  Sheldon Cooper  ‧  Penny  ‧  Howard Wolowitz  ‧  Rajesh Koothrappali  ‧  Amy Farrah Fowler  ‧  Bernadette Rostenkowski-Wolowitz    Stuart Bloom  ‧  Leslie Winkle    The Social Group
Recurring Mrs. Wolowitz  ‧  Barry Kripke  ‧  Priya Koothrappali  ‧  Dr. V. M. Koothrappali  ‧  Mrs. Koothrappali  ‧  Lucy  ‧  Mrs. Mary Cooper  ‧  Zack Johnson  ‧  Dr. Beverly Hofstadter  ‧  Mike Rostenkowski  ‧  Emily Sweeney  ‧  Alex Jensen  ‧  Professor Proton  ‧  Althea  ‧  Cinnamon
Cast Regulars Johnny Galecki  ‧  Jim Parsons  ‧  Kaley Cuoco-Sweeting  ‧  Simon Helberg  ‧  Kunal Nayyar  ‧  Mayim Bialik  ‧  Melissa Rauch  ‧  Kevin Sussman  ‧  Sara Gilbert  ‧  Carol Ann Susi  ‧  John Ross Bowie
As Selves Wil Wheaton  ‧  Mike Massimino  ‧  Stephen Hawking  ‧  Katee Sackhoff  ‧ Steve Wozniak  ‧ Buzz Aldrin  ‧ Summer Glau  ‧ James Earl Jones  ‧ Carrie Fisher  ‧ Brent Spiner  ‧ Bill Nye  ‧ George Smoot  ‧ George Takei  ‧ LeVar Burton  ‧ Neil deGrasse Tyson  ‧ Brian Greene  ‧ Charlie Sheen
Crew Writers Chuck Lorre * (Creator)  ‧  Bill Prady * (Creator)  ‧  Steven Molaro *  ‧  Steve Holland *  ‧  Maria Ferrari *  ‧  Jim Reynolds *  ‧  Eric Kaplan *  ‧  Anthony Del Broccolo  ‧  Lee Aronsohn *  ‧  Dave Goetsch *  ‧  Tara Hernandez  ‧  Richard Rosenstock *
Directors Mark Cendrowski  ‧  Peter Chakos * (mainly as Editor)  ‧  Anthony Rich  ‧  James Burrows
Science consultant : David Saltzberg Director of photography : Steven V. Silver
Costume designer : Mary T. Quigley * Unit production manager : Kelly-Anne Lee *
Theme composer / performer : Barenaked Ladies Chuck Lorre Productions
also as Producer The Big Bang Theory : Full cast & crew on IMDb

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