Dr. Grant Linkletter is a physics professor at East Texas Tech. His research spans gravitons and solar neutrinos.
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, 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.
A Pager, a Club and a Cranky Bag of Wrinkles Dr Linkletter avoids Sheldon every time he has lunch or bothers him. Dr Linkletter sees Sheldon’s true colors as arrogant jerk who thinks he knows everything.
- His romantic interest in Meemaw shows that he’s single. But whether he is a widower or divorced is unknown. It is also unknown if he has any children.