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Dr. Grant Linkletter is a physics professor at East Texas Tech in the early 1990s. Working from string theory to experimental cosmology, his research spans gravitons and solar neutrinos. Alongside rival Dr. John Sturgis, Dr. Linkletter serves as Sheldon's advisor, securing him a position at Heidelberg University's summer research program for work on superstrings.

Series overview[]

Dr. Linketter first appears in “A Nuclear Reactor and a Boy Called Lovey” at a university event which Dr. Sturgis attends with Meemaw. Dr. Linkletter is introduced to be working on an intriguing theory of quantum gravity -- basically, it's a string theoretic interpretation of the graviton.

In “A Swedish Science Thing and the Equation for Toast”, Dr. Linkletter reaches out to Meemaw when Dr. Sturgis has an incident at the university.

In “A Broom Closet and Satan's Monopoly Board” With Dr. Sturgis still away, Meemaw asks Dr. Linkletter if Sheldon can attend his lectures, to which he says yes.

In “An Entrepreneurialist and a Swat on the Bottom”, Dr. Linkletter invites Sheldon and Meemaw to attend a lecture with him, but Meemaw fears he's using Sheldon to get to her. Sheldon later calls him to ask if this is true, but he lies.

In “An Academic Crime and a More Romantic Taco Bell”, Sheldon asks Dr. Linkletter for advice when he feels Dr. Sturgis is unfairly using his work.

"A Philosophy Class and Worms That Can Chase You" where Dr. Linkletter has to deal with Sheldon full time in four years. He tried to advise Sheldon to drop the philosophy class if he wasn't interested. Later in "An Existential Crisis and a Bear That Makes Bubbles," when Sheldon's sense of reality is shattered by his philosophy professor and interrupts his lecture on the Ising model of ferromagnetism for his solid state physics course, he brings him into the office where Meemaw and the professor are discussing the impact of her class. Dr Linkletter is shocked when he considered changing his major from physics to philosophy.

Dr. Linkletter is analyzing dark matter axion interactions in the non-relativistic limit, yet Dr. Sturgis believes he has the free-streaming length of the axion too long, thus, erasing the fluctuations. Sturgis asserts that he'll never have the resolution to see micro-Kelvin features. Later, considering his rival's mathematics as feeble-minded, Linkletter continues his cosmological parametrizations, approximating the cosmic microwave radiation as one Rydberg unit of energy per the redshift. Sturgis angrily alters the blackboard to include Robert Dicke's value. A further point of contention arises when Dr. Lee wants to mount a radio telescope on the roof, with Linkletter suggesting a well-chosen small region of the sky — Sturgis wants to scan a square-degree sector of the sky, in arc minutes max, and Sheldon chimes in with wanting a linear section across the horizon. (A Free Scratcher and Feminine Wiles)

Dr Linkletter calls Meemaw for a date, saying it has been 6 weeks since he asked her out. He also mentions it had previously been 9 weeks. In his office, Sheldon visits and tells his plan of writing a Star Trek episode. Dr Linkletter was told by Sheldon of his plan for a Star Trek episode that included time travel. Meanwhile, he called a restaurant to set up an appointment for 8 but is told by Sheldon that is too late for Meemaw, so he sets it for 630; Sheldon goes on so he says into the phone that he would call back. Later, they are on a date at Piñata Pete's. They gossip and talk about a few things. He had chosen this place because he imagined all the other men would pick Mexican, so he wanted to try out Polynesian. He drinks a drink that he describes as a Polynesian margarita. They end up talking about various stuff. (Future Worf and the Margarita of the South Pacific)

One time, he wanted to cash in the new system that Sheldon had developed so he tried to convince President Hagemeyer about it. Then, he brought his cousin, who is a lawyer, to write a contract. (Legalese and a Whole Hoo-Ha)

Linkletter was working in his office when Sheldon comes in asking for advice regarding sarcasm. After a short conversation, Linkletter gets fed up after Sheldon fails to understand sarcasm, telling him to leave. (Teen Angst and a Smart-Boy Walk of Shame)

He was asked whether he can be a faculty mentor for Sheldon in the student's astronomy and telescope endeavors in a search for non-Earth intelligence. He refused to help Sheldon, calling it the tin foil hat brigade. (Little Green Men and a Fella's Marriage Proposal)

Linkletter was not amused when Sheldon asked him to be faculty adviser when he wanted access to the telescope. He later saw some of the research done under Professor Prakash, and was impressed. He was delighted to hear Sheldon was accepted to a program in Heidelberg, Germany, and was eager to see him go; He passed around an envelope to beg for money and delivered it to them at their house. (German for Beginners and a Crazy Old Man with a Bat)

Linkletter is teaching class when Sheldon brings out food to eat. Sheldon remarks he does this as he attempts to adjust to the time zone in Germany, to Linkletter's annoyance. He goes back to teaching class. (A Romantic Getaway and a Germanic Meat-Based Diet)

Sheldon calls Linkletter while he is in Germany, but because of the time difference, it is 3 in the morning in Texas and Linkletter is asleep. He gives Sheldon advice when he feels that he is not the smartest student in the class, telling him to just listen and stop talking. (A Roulette Wheel and a Piano Playing Dog)

Sheldon and Dr. Linkletter come in and eats dinner with the rest of the family after Georgie and Mandy's wedding, Dr. Linkletter tells a story about his time at France. (A Proper Wedding and Skeletons in the Closet)

He would return in "A Fancy Article and a Scholarship for a Baby" and "A Little Snip and Teaching Old Dogs".



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  • Dr. Linkletter possesses an I.Q. of 159, has 272 papers published and can speak some French (Young Sheldon S5E14, A Free Scratcher and Feminine Wiles).
  • His office door plaque reads Prof. Grant Linkletter | Theoretical Physics. He has a diploma from Yale University. (Young Sheldon S6E18, Little Green Men and a Fella's Marriage Proposal).
  • His romantic interest in Meemaw shows that he's single. But whether he's divorced, widowed or a father etc. is unknown.
v · e · d
Young Sheldon Characters
Main Characters Main Sheldon Cooper  ‧  Mary Cooper  ‧  George Cooper Sr.  ‧  George Cooper Jr.  ‧  Missy Cooper  ‧  Meemaw  ‧  Jeff Difford  ‧  Billy Sparks  ‧  Amanda McAllister
Recurring and Minor Characters John Sturgis  ‧ Tam Nguyen  ‧  Paige Swanson  ‧  Veronica Duncan  ‧  Brenda Sparks  ‧  Herschel Sparks  ‧  Victoria McElroy  ‧  Evelyn Ingram  ‧  Wayne Wilkins  ‧  Hubert Givens  ‧  Sheryl Hutchins  ‧  Gene Lundy  ‧  Tom Petersen  ‧  Le Nguyen  ‧  Trang Nguyen  ‧  Mai Nguyen  ‧  Kim-Ly Nguyen   ‧  Barry Swanson  ‧  Linda Swanson  ‧  Erica Swanson  ‧  Dale Ballard  ‧  Selena  ‧  Robin Difford  ‧  Jana  ‧  Marcus Larson  ‧  June  ‧  Grant Linkletter  ‧ Linda Hagemeyer  ‧ Pat  ‧ Professor Boucher  ‧ Jim McAllister  ‧ Audrey McAllister  ‧ Amber