Arthur Candy

Professor  was on the faculty of Luna University's archaeology department. Much of his research centred on the Doctor. He concluded that the Doctor had a generally negative and dangerous effect on history. His attempt to give a lecture to this effect in 2643 was pre-empted by the Doctor. (PROSE: Continuity Errors) The Doctor left him in Birmingham in 1996. (PROSE: Afterword by Professor Candy)

In 2593, Professor Candy accompanied Bernice Summerfield to a dig on Perfecton, where he experienced the action of the Grel and what happened in Pantoland. (AUDIO: Oh No It Isn't)

River Song found a business card with his name on it tucked into her diary the day after she was admitted to the hospital in the 52nd century, under the care of the Sisters of the Infinite Schism. The card stated that Professor Candy was part of Luna University's Department of Antiquities. (GAME: The Eternity Clock)

In 5123, Professor Candy conducted River Song's graduate admissions interview. In response to his query as to her motivation to study archaeology, she cryptically answered that she was "looking for a good man." (TV: Let's Kill Hitler)

It would appear that there are, in fact, multiple Professor Candys, comprising a family of successive clones over a period of several centuries (PROSE: Big Bang Generation).