A.O. Osgood

By 2005, A.O. Osgood wrote Rubber-Soled Shoes and Silver-Tipped Bullets – A Life in Supplies, which was in the "Historical and Reminiscent" genre and was publicised on the UNIT website. (NOTVALID: UNIT Publications)

Behind the scenes
It is not clear if A.O. Osgood is related to Tom Osgood or Petronella Osgood; furthermore, this character may have actually been intended to be Tom Osgood, as his name was never revealed on television and only in spin-off novels and comics, and as such, the author may not have known about the forename.