Graham Williams
From Tardis Wiki, the free Doctor Who reference
Graham Williams (died 17 August 1990, Tiverton, Devon, UK) was producer of Doctor Who from "Horror of Fang Rock" through "Shada". He co-wrote City of Death and The Invasion of Time - both stories being credited to David Agnew - as well as The Nightmare Fair, which was intended to open Season 23, but was cancelled in favor of The Trial of a Time Lord. Williams also wrote the novelisation of The Nightmare Fair which was published by Target Books.