 He even found the time to write books under various versions of his own name as well as other pseudonyms, Dennis Sinclair and Sinclair MacKellar.But it was his pseudonym Peter Carter Brown then later, Carter Brown ('Peter' was dropped for the US market) who was to become the international best-selling pulp fiction author.The extraordinary early success of Carter Brown in the 1950s meant that Yates was contracted to produce one short novel and two long novels each month.