Peter Harness
From Tardis Wiki, the free Doctor Who reference
Peter Harness was a Doctor Who television writer who wrote for series 8 through 10. He penned his Doctor Who debut, Kill the Moon, for series 8, and a Zygon two-parter for series 9, The Zygon Invasion / The Zygon Inversion.
In 2017, Harness co-wrote The Pyramid at the End of the World for series 10, with head writer Steven Moffat, which continued on from Moffat's Extremis.