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"I am a stwing pwagmatist. I say I'm gonna pwove something that cannot be pwoved, I appwy for gwant money, and then I spend it on wiquor and bwoads."
―Barry Kripke, The Relationship Diremption

Barry Kripke, Ph.D. is a Caltech plasma physicist and string theorist as well as a colleague of Leonard and Sheldon. He has a case of rhoticism, where he pronounces "R" and "L" as "W", much like Elmer Fudd in Looney Tunes. With a knack for ribbing people, he is a friend to Leonard, Howard, Raj and Amy. He also has an on-and-off platonic relationship with Sheldon Cooper.

Series Overview[]

Season 2[]

In his first appearance, he pitted his "kiwwa wobot," the Kripke Krippler (or as he called it, the "Kwipke Kwippwuh"), originally designed for the Southern California Robot Fighting League Round Robin Invitational, against the guys' robot (M.O.N.T.E.) in an unofficial robot battle at the Caltech kinetics lab ("The Killer Robot Instability"). On another occasion, Barry ridiculed Leonard's unsuccessful anti-proton decay experiment, while Sheldon attempted to befriend Kripke in order to gain access to an open science grid computer to carry out research on structure formation in the early universe; however, Sheldon's efforts were abandoned when he realized that Kripke had no say in who used the computer. Kripke comes on to Penny the same way Howard does, after disgusting her by cleaning his gum pockets for new food, but deciding the name Penny wasn't hot enough he proceeded to call her 'Woxanne' "Roxanne", much to her annoyance ("The Friendship Algorithm").

Season 3[]

He continued to appear in Season 3, where he mocked Sheldon consistently. Kripke humiliated Sheldon for his retraction regarding his monopolar blunder, and stated that, unlike this situation, Einstein's cited mistake concerning the cosmological constant might have been right all along ("The Electric Can Opener Fluctuation"). He injected helium into Sheldon's office while he was doing a radio interview, sharing it via portable radio in the cafeteria. With encouragement from Leonard and Rajesh Koothrappali, Sheldon retaliated by dumping foam all over Kripke and the plasma lab while the president of the university and the board of directors were in the room, as he was showing them how a NSA grant was being put to use with a micro-controlled plasma experiment ("The Vengeance Formulation").

Season 4[]

A year later, he was invited to Sheldon and Leonard's apartment by Sheldon during the former's attempt to establish a new social group, along with Zack Johnson, Stuart Bloom, and (Sheldon hopes) LeVar Burton, after Sheldon becomes angry with his friends for eating at Raj's apartment. Zack impresses Barry and Stuart with his tale of a naked woman in a hot tub, and later the three end up singing karaoke using the karaoke machine Barry keeps in his car, much to Sheldon's dismay ("The Toast Derivation").

Season 5[]

In this season, Barry tells Sheldon, who still has some rivalry with him, as well as Rajesh Koothrappali, that Robb Rothman urinated in the particle physics lab again and his retirement potluck had to be moved up. When Raj speaks to his phone Siri, Kripke, still in their office, points out that he too has that phone and complains about voice recognition difficulties, supposedly unaware of his own rhotacism or that Siri can't acknowledge it. On the matter of the phone, he further reveals his perverse nature by stating that his phone took photos of his "junk" for Craigslist as Raj is offended by his negativity regarding Siri ("The Beta Test Initiation").

In "The Rothman Disintegration", Barry argues with Sheldon over who will receive Robb Rothman's office, taking the issue to President Siebert, and challenging Sheldon to a basketball match, a game in which they are equally bad. He appears again in "The Stag Convergence" as a party guest before Howard's marriage} and he kept on complaining that there were no strippers.

Season 6[]


Kripke talking to Sheldon.

Kripke returned in "The Cooper/Kripke Inversion" besting Sheldon at work and causing him to lie about sleeping with Amy (which Kripke believed to be why Sheldon's paper wasn't as good as expected). Kripke enjoyed hearing about Sheldon's "sex life," prying for details.

During the events of "The Tenure Turbulence," Kripke impresses the tenure committee (Janine Davis) with ease, especially compared to Leonard, Sheldon, and Raj.

Season 7[]

After Sheldon retracts his paper on the existence of a new super-heavy element in "The Discovery Dissipation", Kripke came to his office to mock him, suggesting that he should take on a superhero identity as "The Retractor". When Sheldon responded with a comment about his speech impediment, Kripke seemed hurt, but actually used Sheldon's apology as the setup for another "Retractor" joke.

In "The Relationship Diremption", Barry taunts Sheldon after new discoveries make his twenty years of work on string theory useless, and laughs upon hearing about him drunk dialing Stephen Hawking. He also taunts Howard by referring to him as "Cwogziwwa" (Clogzilla). 

Season 8[]

In "The Champagne Reflection", Barry is seen as a guest of Sheldon's Internet broadcast, "Sheldon Cooper presents Fun with Flags". He is playing the game "Flag or Not Flag", where he is shown flash cards and has to identify the flags. He calls out "fwag" or "not a fwag" and appears to be very good at the game.

In "The Comic Book Store Regeneration", Barry thanks Amy for her insight in suggesting how a cellular automaton approach to neuronal conductivity may be applicable to string theory. As such, his light-cone quantization paper received an amazing response. This irked Sheldon, since his string theory research hit a dead end and Amy did not lend help to him.

Season 9[]

In "The Perspiration Implementation", Barry Kripke instructs the guys in fencing when they want to join his new fencing club. He learns that Sheldon and Amy are broken up and he asks her out. Amy turns him down, but she does get a naked picture of him that shocks Penny and Bernadette, but does not seem to bother Amy.

In the following episode "The Helium Insufficiency", as he is doing a superfluid quantum excitation study, Kripke has all of the university's liquid helium reserve in his control, which he refuses to let Leonard and Sheldon use for their experiment to test their theory, unless they include his name on their project.

In "The Valentino Submergence", he interrupts Fun with Flags to talk about his love life. He ends up creeping Amy out with questions demanding details about her sex life.

In "The Celebration Experimentation", Kripke attends Sheldon's birthday and keeps hitting on Leonard's mother who enjoys the attention, which annoys Leonard. He also knows that Bernadette is expecting, but no one had told Stuart.

Season 10[]

He reappears in "The Geology Elevation", where he is the only person besides Howard who likes the motorized Stephen Hawking toy; however, Howard realizes how offensive the toy really is when Kripke wants to drive it into the women's restroom.

He is mentioned in "The Allowance Evaporation" when Sheldon lists the people he told about him and Amy sleeping together once a year.

Season 11[]

In "The Tesla Recoil", after learning Sheldon went behind their backs to work with the military using the trio's quantum technology as the basis for a communication system, Leonard and Howard say Sheldon is like Thomas Edison, taking credit for other's ideas, while they are more like Nikola Tesla. Unable to make it work themselves, Leonard and Howard bring in Kripke to help with the mathematics in developing a more efficient neutrino comm system that swaps out helium for xenon (which can be stored at higher temperatures and has a bigger nucleus, thus coherence would make it an easier signal to see), rendering Sheldon's system obsolete. However, once Kripke calculates the probability of interaction using the cross section, he betrays them and goes to the military himself, cutting out Leonard and Howard.

He reappeared in "The Athenaeum Allocation". Shamy is trying to book their wedding at the Athenaeum Club at Caltech, but Kripke has already selected that location as the place where he's going to have his birthday party. Eventually, after scrubbing some irradiated grease out of barrels, Shamy is allowed to have the Athenaeum as their wedding location, but Amy doesn't like how Kripke is going to sing "Volare" at their wedding, and they are thinking about other locations like the planetarium.

In "The Bow Tie Asymmetry", Barry appears as Sheldon and Amy walk down the aisle and he sings "At Last" by Etta James. Shamy looks a bit embarrassed as Leonard and Penny get a laugh out of it.

Season 12[]

He appeared in "The Grant Allocation Derivation". Kripke is first seen in the cafeteria where he tells Leonard how bad he feels about bullying Leonard he gives Leonard a hug and he slips an El Pollo Loco coupon in his pocket. Later Barry, Doctor Lee, and Raj all ask Leonard to fund their Project's but Leonard tells them he can only fund one project.

In The Plagiarism Schism, Kripke offers to help Sheldon and Amy prove that Greg Pemberton, one of their Nobel Prize rivals, plagiarized his doctorate paper. After they refuse, Leonard accepts the offer for them and obtains the evidence.



In the penultimate episode "The Change Constant", Kripke uses a fake Swedish accent to prank call Sheldon into thinking he won the Nobel Prize. Barry said, Hewwo, this is Sweden cawing. Is this Dr. Coopewa and Dr. Fowwea? Congwatuwations! It is my pweasuae to infowm you that you have won the Nobel Pwize in being suckas!" It worked in fooling the gullible Sheldon.


"We’re all pathetic and cweepy and can’t get girls, that’s why we fight wobots."
―Barry Kripke, The Killer Robot Instability

Despite being a stereotypical geek, Barry apparently tries to be fairly sporty, as shown in "The Friendship Algorithm". In that episode, it was implied that he enjoys polo, water polo, and rock-climbing. "The Rothman Disintegration" reveals that Kripke and Sheldon are "equally bad" at sports. Unlike his colleague, Kripke is fully aware of his limitations and shortcomings, even admitting that he is "creepy, pathetic and can't get girls". He has been known to make inappropriate comments to women, photograph his own gentials and upload the shots to the Internet ("The Beta Test Initiation"), and enjoys hanging out at a strip club near his apartment, which has a free buffet ("The Rothman Disintegration"). He also seems to enjoy strippers.

Kripke is often suggested to be coasting in his job—in one instance he even goes as far to say that "[he] says [he]'ll prove something that can't be proved [string theory], then use the money for 'wiquow and bwoads' "liquor and broads". In other instances he engages in robot fighting and makes numerous allusions to his promiscuity (though he appears mostly romantically unsuccessful). On the other hand, in "The Cooper/Kripke Inversion", Sheldon admits Kripke's grant proposal for a fusion reactor for Caltech is "leaps and bounds" ahead of his [Sheldon's] own. This suggests that Kripke is quite capable—despite Leonard not believing Kripke to be smarter than Sheldon, Kripke is apparently able to work at Sheldon's level. This may be the reason for Kripke's success in retaining his job despite his apparent predilection for coasting.



The Big Bang Theory Episodes
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Young Sheldon Episodes
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Appeared M = Mentioned Did not appear Not aired/Not available
V = Voiced C = Cameo F = Flashback I = Indirectly mentioned P = Pictured


  • Like Stuart, Kripke appears in all seasons except Season 1.
  • One of Kripke's research concentrations is the physics of fusion plasmas, illustrated by his work on a grant proposal for a new fusion reactor. He has also referred to himself as a string "pragmatist", after Sheldon pointed out he is a fellow string theorist. As he is a plasma physicist, albeit experimental, he most likely studies the connection between string theory and the quark-gluon plasma. (Analogous parameters to those of "classical" plasma physics can be used to characterize the QGP in liquid state.) "The Helium Insufficiency" and "The Tesla Recoil" emphasize his work on quantum fluids. Note that plasma physics has a phenomonelogical treatment, and it is conceivable for him to be equally skilled in both theoretical and experimental physics akin to Italian nuclear physicist Enrico Fermi.
  • He has many interests, including Star Trek (although he admits he hasn't watched it since he discovered the strip club near his apartment), raffle, karaoke, ventriloquism, polo, water polo and rock climbing, but he doesn't like monkeys.
  • Sheldon has seniority over him, having arrived at the university before Kripke.
  • Barry's Siri recognizes him as "Bawwy" as it stated when he asked it to "wecommend a westauwant" (recommend a restaurant; however, beyond calling him his name as he fed it into the program, Siri is unable to parse Barry's rhotacism, resulting in Barry being highly dissatisfied with the software (in this case he is implied to be unaware of the distortion in his speech produced by his impediment).
  • Barry is ostensibly named after philosopher and logician Saul Kripke.
  • It's also possible that the name "Kripke" is a play on the name of the software protection program "Crypkey." It could also be a play on words for "Crypt Key" a popular item within MMORPG games.
  • Another possible origin could be the name of the 'makeout-place' that is mentioned in "Terminator 3", 'Mike Kripke's Basement'.
  • Through all his appearances on the series, Sheldon won only once against Kripke, in the episode "The Rothman Disintegration", where Sheldon managed to snag the former office of Robb Rothman (who had taken leave of his faculties, likely permanently) in which Kripke was also interested, by defeating Kripke in an impromptu ball bounce height contest held in the university gym (originally a basketball game, which was later changed due to both of them being lousy at the sport).
  • In the Mexican version of the show, Barry does not have rhotacism in the first three seasons, but he speaks with a German accent in season 4. It is not until the fifth season that his rhotacism appears.
  • Also, in the Brazilian version of the show, instead of rhotacism, he pronounces "s" and "c" as "th", and "r" as "g" (e.g., he pronounces the Portuguese word "restaurante" as "gethtaugante")
  • When asked on Twitter if Kripke was aware of his rhotacism, actor John Ross Bowie suggested he was not [1], though the episode "The Discovery Dissipation" later made it clear that he is; however, the issue is portrayed inconsistently: in "The Beta Test Initiation", Barry cannot fathom why his Siri personal assistant app cannot parse his rhotacistic speech; however, in "The Discovery Dissipation" he reacts to Sheldon's off-color taunt about his impediment in a way which clearly shows he is aware of it.
  • In "The Toast Derivation" Sheldon unintentionally said “whaffle” instead of ‘raffle’ when talking to Barry about it after he(Barry) had said ‘whaffle’
  • In Season 10, since he only appeared in one episode ("The Geology Elevation"), he did not antagonize Sheldon because he only had a minor appearance in one scene. Season 10 is the only season to only feature Barry once in a season, where as in previous seasons, he reappeared in various episodes. This is due to Bowie filming Speechless.
  • His birthday might be May 12 due to Kripke having booked the Athenaeum for his birthday party.


v · e · d
Characters Main Leonard Hofstadter  ‧  Sheldon Cooper  ‧  Penny Hofstadter  ‧  Howard Wolowitz  ‧  Rajesh Koothrappali  ‧  Amy Farrah Fowler  ‧  Bernadette Rostenkowski-Wolowitz  ‧  Stuart Bloom  ‧ The Social Group  ‧ Emily Sweeney  ‧  Leslie Winkle
Recurring and Minor Debbie Wolowitz  ‧  Barry Kripke  ‧  Priya Koothrappali  ‧  Dr. V. M. Koothrappali  ‧  Mrs. Koothrappali  ‧  Stephanie Barnett  ‧  Lucy  ‧  Mary Cooper  ‧  Zack Johnson  ‧  Beverly Hofstadter  ‧  Mike Rostenkowski  ‧  Alex Jensen  ‧  Professor Proton  ‧  Missy Cooper  ‧  Ramona Nowitzki  ‧  Dan  ‧  Josh Wolowitz  ‧  Dennis Kim  ‧  Althea Davis  ‧  Jeanie  ‧  Cinnamon  ‧  Mrs. Rostenkowski  ‧  Wyatt  ‧  Claire  ‧  Kurt  ‧  Eric Gablehauser  ‧  Dave Gibbs  ‧  Dimitri  ‧  Alfred Hofstadter   ‧  Meemaw  ‧  Jimmy Speckerman  ‧  Susan  ‧  Randall  ‧  Bert Kibbler  ‧  President Siebert  ‧  Janine Davis  ‧  Richard Williams  ‧  Halley Wolowitz  ‧  Neil Michael Wolowitz  ‧  Denise  ‧  George Cooper Jr.   ‧  Larry Fowler  ‧  Anu  ‧  George Cooper Sr.  ‧  Marissa