Brett (The War Machines)

Professor Brett was a computer scientist who created WOTAN.

Biography
The First Doctor's companion Polly Wright originally worked as Brett's secretary. Brett was hypnotised by his creation WOTAN to aid it in its plot to conquer Earth. He was sent to a warehouse where he oversaw the creation of War Machines. His mind was freed when WOTAN was destroyed. (DW: The War Machines)

Afterwards, he explained away his behaviour by saying that he had suffered a nervous breakdown. (MA: Who Killed Kennedy)