Allegedly a former British spy, Christopher Steele: http://www.dailymail.co.uk/news/article-4109382/Russian-agents-trying-dig-dirt-Donald-Trump-not-assume-friend-says-former-Foreign-Secretary.html
Mr Steele, 52, is the director of a private security and investigations firm called Orbis Business Intelligence Ltd, run out of plush offices in Westminster, central London. . .However, a diplomatic service list shows that the ex-spy was posted to the U.K.'s Moscow embassy in 1990 with the title of 'Second Secretary', serving under ambassador Sir Rodric Braithwaite.