Whitaker (Invasion of the Dinosaurs)

Professor Whitaker was a British scientist who developed a working time travel theory.

Biography
Amongst his work included the measurement of the internal weight of atoms. He also contributed to the analysis of magnetic infractions. (PROSE: The Dinosaur Invasion)

He applied for a government grant, but was turned down, and after being ridiculed for his ideas, dropped out of the public eye and began secretly working on a machine that could manipulate time.

Whitaker later worked with Sir Charles Grover on Operation Golden Age. Working with his assistant, Butler, he brought various dinosaurs forward in time to clear London of its inhabitants.

Whitaker gave Mike Yates a device to sabotage the Third Doctor's stun gun to prevent him from capturing a dinosaur. Whitaker materialised a Tyrannosaurus rex by the Doctor in the hopes it would kill him, but the dinosaur was knocked out by Yates.

While preparing for the final countdown, their plans were exposed by the Doctor. Grover tried activating the machine, but unbeknownst to him, the Doctor had disabled it by reversing the polarity. Whitaker, knowing this, tried to stop Grover, but it was activated and sent both of them to an unknown point in the past. (TV: Invasion of the Dinosaurs)