From TARDIS Index File, the free Doctor Who reference.

Edward Travers
Race:	Human
Home Planet:	Earth
Home Era:	20th century
Appearances:	DW: The Abominable Snowmen DW: The Web of Fear NA: The Dimension Riders MA: Downtime
Actor:	Jack Watling

Professor Edward Travers CBE was a British anthropologist and explorer. In 1935, he set out on an expedition to Tibet to find the Tibetan Yeti. At first suspicious of the Doctor, he eventually aided him in defeating the Great Intelligence. (DW: The Abominable Snowmen)

Travers brought back one of the robot Yeti used by the Intelligence, eventually selling it to Julius Silverstein. Travers later had a daughter, Anne. (DW: The Web of Fear)

In the 1960s, Travers met postgraduate student James Rafferty, and took him into his confidence regarding a Yeti control sphere. (NA: The Dimension Riders)

An older Travers cowers before a Yeti in the 1960s

Travers eventually succeeded in reactivating one of the Yeti's control spheres, which led to the Intelligence attacking London. He and Anne assisted the Doctor and the army task force led by Colonel Lethbridge-Stewart in defeating the Intelligence once more. (DW: The Web of Fear)

Four years later, the Doctor tried recontacting Travers again, but learned from Isobel Watkins that he and his daughter had gone to spend a year in the United States. (DW: The Invasion)

Travers spent years trying to learn all he could about the Intelligence, even researching at the Library of St John the Beheaded. His reputation was ruined by Ashley Chapel. (MA: Millennial Rites)

Travers died on 25th December 1980 after spending his last few years living in isolation in Tibet. His reanimated corpse was used as a host for the Great Intelligence. (MA: Downtime)