Thomas Ernest Bennett "Tibby" Clarke (known as T.E.B. Clarke), OBE (1907-1989) was an English film screenwriter who wrote several of the Ealing Studios comedies.
Elizabeth Shull Russell (1913 – 2001), also known as "Tibby" Russell, was an American biologist in the field of mammalian developmental genetics, spending most of her career at the Jackson Laboratory in Bar Harbor, Maine. Russell is most recognized for her ground breaking work in pigmentation, blood-forming cells, and germ cells. She also raised awareness of the benefits of genetically-defined laboratory animals in biomedical research.