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Philip MartinBorn: 1938 (age: 75)
Philip Martin wrote the two Sill stories Vengeance on Varos and Mindwarp, which he also novelised for the Target range.
He also wrote the Find Your Fate book Invasion of the Ormazoids and the Target Missing Episodes novel Mission to Magnus, which would later be made into a Big Finish audio story as part of The Lost Stories range.
Away from Doctor Who he had an extensive career as a TV Screen writer, working on many classic dramas.