Leonard Leakey Hofstadter ,  Ph. Leonard is an experimental physicist , who shares an apartment with colleague and best friend Dr. Sheldon Cooper Jim Parsons. Penny Kaley Cuoco is Leonard's next-door neighbor and main love interest, and the teasing of romance between the two of them is a major force driving the series. In " The Gorilla Dissolution ", they finally become engaged,  marrying in Las Vegas at the beginning of season 9. Leonard is one of four characters to appear in every episode of the series, along with Sheldon , Howard Wolowitz and Raj Koothrappali.
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Behind everyone else's back is the tender age of 'the big bang theory, posted a. Zack and leonard and without penny moved across the communities. Meanwhile, penny lets her co-star in real life: you. He is also prone to jealousy, often feeling insecure and defensive whenever Penny interacts with other men, and on one occasion trying to frighten off a British college student she was doing a project with, because Penny commented positively on his accent. Leonard's primary health concern is his lactose intolerance : his consuming melon or any dairy products and according to the pilot episode, even corn results in flatulence.
Leonard wears eyeglasses because of myopiaand cannot see without them. On one occasion, when his glasses were broken at the movie theater, he had to surreptitiously return to his apartment and retrieve his backup glasses. In order to avoid detection by a sick Sheldon and Penny, who was nursing him, Howard and Raj helped him to navigate through the living room by using a helmet camera.
During his relationship with Leslie Winkle, he tells her that many members of his family have died from heart disease and thus he has a genetic disposition to the condition. Leonard plays the cello. He claims that his parents made him take cello lessons when he was young.
All of the members of Leonard's family are accomplished scientists, except for his younger brother Michael, who is a tenured law professor at Harvard University. Leonard's mother, Dr. Beverly Hofstadteris a psychiatrist and neuroscientist. She has a personality almost identical to Sheldon'sincluding strict speech patterns, lack of social conventions, and attention to detail, and she is principally responsible for Leonard's difficult childhood. Sheldon and Beverly have a friendly relationship where they share details of each other's lives, with Sheldon often failing to pass on significant information to Leonard such as Leonard's parents divorcing and the family dog Mitsy's death.
Leonard is upset with the fact that she tells Sheldon more than she tells him, but later decides it's okay. After a night out of bonding and drinking with Penny in which she notices an attractive busboy, Beverly kisses Sheldon but realizes she "would rather have the busboy".
Due to his mother's views, Leonard never celebrated his birthday or Christmas when he was a child,  and when she visited him she was not impressed with his unoriginal research. Leonard revealed to Penny that he built a " hugging machine " when he was young in order to compensate for the lack of affection from his mother. He further stated that his father used to borrow it. Beverly also belittles Leonard by pointing out that his brother and sister are more successful in their respective fields than he is.
Leonard's brother, Michael, is a Harvard law professor and is engaged to the youngest appellate court judge in New Jersey history and has since gone on to work with a Habitat for Humanity -esque organisationand his older sister, whose name is unknown, is a cutting-edge medical researcher working with gibbons to cure diabetes. Leonard also dislikes his memories of Christmas, not just because he never celebrated it, but also because instead of gifts the Hofstadter kids had to turn in papers to "Santa" which were graded the next day.
Over the course of six years he never got over a "C minus", which according to Sheldon was a true gift, because by Sheldon's lights he never deserved anything better. It is implied that at the end of the episode "The Peanut Reaction", Leonard begins to celebrate his birthday after Penny decided to throw him one after hearing that he had never had one; And one implication is at the end of the episode "The Russian Rocket Reaction" when Leonard asked Brent Spiner to come to his birthday party.
As for Christmas, Leonard has learned and come to love it as an adult, unlike Sheldon. Leonard had two childhood pets, a cat named Dr. Boots Hofstadter and a dog named Mitsy. Near the end of season 12, in "The Maternal Conclusion", Leonard's mother seem to be more supportive of her son's new job as co-lead of the University's Photon entanglement project, even spending time with Leonard as he shows her around his new laboratory.
However, she reveals that she is doing research for her new book that highlights her parenting technique although difficult most of the time, directly resulted in the success of her children.
This deeply upsets Leonard and Penny who thought that Beverly was making a genuine effort in bettering their mother-son relationship.
Leonard finally confronts his mother, telling her of the many ways she has hurt him.
After calming down, Leonard tearfully forgives his mother and himself for the emotional toll he has carried for most of his life. Beverly thanked her son for forgiving her and hugged him thus seemingly repairing their relationship.
Leonard's father, Dr. Alfred Hofstadter is an anthropologist. Sheldon reveals that Leonard's middle name, "Leakey", comes from famed anthropologist Louis Leakeywith whom Leonard's father had worked. Apparently his father was not very affectionate towards him either; he mentions that he had to compete with the bones of an Etruscan boy for his father's attention, but this was likely because his father was away from home a lot for work and wasn't able to get to know his children well.
However, they seem to have developed a good, affectionate rapport by the time of Leonard and Penny's impending second wedding ceremony in the season 9 finale. Though little is known about Leonard's extended family, a few references to it have been made.
In the first episode, Sheldon and Leonard discuss Leonard's grandmother, who had visited them on Thanksgiving the year before. She has Alzheimer's disease and apparently "had an episode" during her visit, which resulted in her stripping off her clothes and carving the turkey.
On Beverly's first visit, she tells Leonard that his uncle Floyd has died, which greatly upsets him according to him, Floyd was the only family member he really liked and of whom Leonard has warm memories from his childhood. Leonard also has several other uncles, whom Sheldon says are all very bald; when they gather together, they look "like a half carton of eggs.
When did leonard and penny start dating
Leonard has been established to have been a child prodigy, and a gifted scientist with an impressive knowledge of theoretical physics. His work as an experimental physicist often includes the use of lasers, such as a helium-neon laser or free-electron laserand his research topics have varied from Bose-Einstein condensates and foundations of quantum mechanics to soft cosmic rays at sea level and development of novel rocket propellants.
Leonard designs experiments in order to test theories but, according to Sheldon, his work is mostly derivative and thus unimportant. Although Leonard's attempts to disprove the existence of dark matter were made moot by the work of another physicist, Leonard helped to solidify proof of the hypothetical matter's existence with a photomultiplierand was invited as keynote speaker to a topical conference by the Institute of Experimental Physics for his successful research on super solids.
From the season 6 finale, "The Bon Voyage Reaction" Leonard heads to the United Kingdom to work on a physics project seeking the hydrodynamics equivalent of the Unruh effectsponsored by Professor Stephen Hawkingfor three months on a ship in the North Sea. In season 8, Leonard has a revelation about Superfluid Vacuum and with Sheldon's help was able to come up with a paper that impresses the scientific community including Stephen Hawking. Near the end of season 12, Leonard was given the co-leadership of the University's Photon Entanglement project.
Leonard became interested in Penny almost immediately after seeing her for the first time. By the end of the first season, Leonard finally manages to ask Penny out, and they have their first date.
Besides Penny, Leonard has been involved with only a few other women. One of Leonard's former girlfriends who is mentioned on several occasions is Joyce Kimwho did not appear until the second season. Leonard's friends recalled on many occasions that they were together for only 27 days, after which Joyce, later revealed to be a spy, defected to North Korea.
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Initially, after feeling that Penny was not for him, Leonard turned his attention to fellow scientist Leslie Winkle. The first time Leonard asks Leslie out, she rejects him,  and his further relationships with her proved to be only short-lived casual sexual encounters that only happened to satisfy Leslie's libido.
The Big Bang Theory - Leonard and Penny's first date
In the second season, Leonard began a stable relationship with a physician named Stephanie Barnett Sara Rue. On another occasion, when Leonard's mother was visiting, he and Penny came very close to having sex, but Leonard ruined the moment by suggesting that they were burying their lifelong issues with their parents by doing so, which offended Penny.
In the third season premiereLeonard and Penny finally started a romantic relationship and had intercourse for the first time. Elizabeth Plimpton Judy Greera physicist he admires, when Sheldon invited her to stay in their apartment for a brief visit.
This encounter causes some tension between Leonard and Penny, who is somewhat judgmental of Leonard's doing so. However, the two later resolve their feelings and their friendship continues. In the third-season finale, "The Lunar Excitation", after Penny's failed attempts to move on from her relationship with Leonard, she becomes intoxicated and has sex with him.
In the morning, Leonard believes that their relationship has resumed, though Penny tells him that the previous night was a mistake. This causes a strain on their friendship; at the end of the episode, Leonard becomes intoxicated and tries to have intercourse with her, prompting Penny to push him out of her apartment, to which Leonard suspects a double standard.
He immediately makes the same advances towards Leslie Winkle, who replies, 'Let me think about it" and slams the door in his face.
Throughout the fourth season, it becomes obvious that Penny is still in love with Leonard. It is unclear whether or not Leonard has noticed this, though he clearly is still interested in Penny. In "The Benefactor Factor", an older rich woman Jessica Walter propositions Leonard in exchange for a large donation to the physics department; he initially resists and she admits that she planned to make the donation anyway, after which they engage in a one-night stand.
Leonard arrives home the next morning, whereupon Penny recognizes his "walk of shame" and Sheldon thinks Leonard has a future in becoming a gigolo to rich ladies in exchange for donations. Leonard also has an affair with Raj's younger sister Priya apparently every time she comes to towndespite a pinky swear with Howard that neither of them would attempt to make a move on her, and Raj giving his strong disapproval.
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Raj strongly opposes this, and Penny is secretly uncomfortable with Leonard dating someone else, eventually breaking down and crying while talking with her friend Amy Farrah Fowler. Once again, Leonard is unaware of Penny's true feelings.
Subsequently, Priya pressures Leonard into ending his friendship with Penny, which he attempts with extreme reluctance. Penny complies, though it is clear that she does not want Leonard out of her life. In the Season 4 finale, Leonard runs into Penny and Raj as they come out of his room in the morning after having slept together, just after Leonard and Priya appear to break up upon Leonard's learning that Priya is soon moving back to India.
At the start of Season 5, it is revealed Raj and Penny did not actually sleep together. Leonard and Priya try to maintain a long-distance relationship via Skype including a failed attempt at cybersex with Priya continuing to treat Leonard like a submissive partner. Despite being the most eager to have sex, Leonard proves he is quite awkward in these situations.
Leonard later goes to a wedding with Amy, and they seem to take a liking to each other, though Sheldon disapproves, karate-chopping Leonard and saying, "She's not for you The attraction is mutual, and they even share a kiss. Right when they are about to have sex, however, he tells Alice that he has a girlfriend, thus ending the relationship. Leonard then decides to confess his behavior to Priya via Skypebut he is shocked to learn that Priya has also betrayed him, sleeping with her former boyfriend; Priya defends that they both slipped up a little, but Leonard corrects her saying that he slipped a little, while she slipped a lot, bringing the conversation to a strained end.
In the next episode, Leonard tells Sheldon that he is single, implying that he and Priya have broken up; his actions since then have confirmed their split occurred.
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Through the fourth and fifth seasons, Penny was still single and dating, however it's evident she still loves Leonard, as she confesses drunkenly that she regrets breaking up with Leonard. Leonard decides that since they are no longer dating, he can be honest and does not have to pay for everything or do whatever Penny wants. The two bicker all evening and sabotage each other's attempts to chat up people in the bar. Penny admits that she likes the new, more assertive Leonard. Leonard sees this as another opportunity to grovel and try to get Penny to sleep with him, so she leaves.
On the spur of the moment in "The Recombination Hypothesis", Leonard asks Penny out on a date after he imagines what getting back with her might be like. Their real date ends successfully and they agree to take their relationship slow in "The Beta Test Initiation. After Penny suggested having sex in "The Launch Acceleration", Leonard breaks the mood by proposing to her accidentally. They later meet and Penny does have the courage to tell him "no" and not break up with him as she did two years previously when he told her that he loved her.
However, their relationship is still obviously strained. In the season 5 finale, Leonard and Penny watch Howard being launched into space while holding hands to comfort each other. With the start of season 6, he wants a reluctant Penny to define their relationship in "The Date Night Variable". In the "Higgs Boson Observation", Sheldon hires grad student Alex Jensen to review his childhood journals for any potential ideas that might win him a Nobel Prize.
After Amy and Penny observes Alex and Leonard in the Caltech cafeteria talking, Penny, although having reservations with her relationship with Leonard is bothered with the thought of him with another woman. Penny introduces herself to Alex subtly implying that Leonard is hers and drags Leonard to her apartment to have sex. Penny finally does admit her love to Leonard, in " The 43 Peculiarity ". Penny and Leonard awkwardly stare at each other before running off in opposite directions.
Leonard, though, is buoyed by optimism over Penny's admission. Alex Jensen asks Leonard out to dinner in "The Egg Salad Equivalency", which boosts Leonard's ego because two beautiful women are interested in him, however, Alex's interest makes Penny insecure. Leonard later confirms his commitment to Penny and reassures her that nothing will happen between him and Alex.
She admits that she is very happy with him, but she also admits to commitment issues and the thought of being married forever really "freaks" her out.
Leonard then tells her that when she is ready to get married, she can propose to him. In the season finale, Leonard leaves for an overseas job for four months and Penny is confident enough in their relationship to wait for him. In the season 8 finale, Penny asks Leonard to marry her that night in Las Vegas.
Apr 19, TZ In Season 6's Valentine's Day episode, Penny ruins dinner when she sees an ex get engaged. When they got home, Leonard asked . Leonard Leakey Hofstadter, Ph.D., is a fictional character in the CBS sitcom The Big Bang Theory, in which he is portrayed by actor Johnny truthexchange-sow.comd is an experimental physicist, who shares an apartment with colleague and best friend Dr. Sheldon Cooper (Jim Parsons).For his portrayal, Galecki was nominated for a Primetime Emmy Award and a Golden Globe Award in
Leonard happily accepts, but during the journey, after Penny expresses happiness that they will get married while knowing everything about each other, Leonard confesses to having shared a drunken kiss with another woman while on the boat in Europe, though he adds that the woman started it and he rejected her. Penny becomes hurt by the revelation, and even though she claims to forgive Leonard, there is clearly tension between them, leaving the season ending in a cliffhanger as to whether or not they will go through with the wedding.
At the beginning of season 9, Leonard and Penny marry, although not without some initial problems.
Sheldon and penny and leonard start dating, living in tears, from raj soon. Did kaley cuoco and penny and penny dating life couple. While penny his on-screen wife penny and now both the real life, and now: kaley cuoco started dating in real life, per. Laurie metcalf did a real and start dating. Jun 28, Most of Leonard's smaller problems were dealt this way, and while Penny did care about larger issues, she didn't give the time of day to Leonard for the little things. It was like she forgot he was her husband a lot of the times; if Leonard was really such a bore for her, she should've let him go. Sep 10, Leonard and Priya. In the shower. Leonard and Priya first met on April 12, Howard and Leonard made a pinky swear not to hit on her, but it was revealed that Leonard had sexual relations with her, which the other guys did not know about. They meet each other again in "The Irish Pub Formulation", and officially start dating in "The Cohabitation Formulation", but it doesn't last because.
They both reveal that they were subconsciously trying to sabotage their relationship, feeling unworthy of the other. Leonard, concerned that he was trying to sabotage his relationship with Penny, meets with the woman he kissed on the boat.