 Martin became a coach at Luton Town in August 1939, and was appointed manager on 4 December 1944.After guiding Luton through their first post-war season, he was appointed as Newcastle United's first manager since the end of World War II in May 1947.One of his decisions at the club was surprisingly to sell prolific goalscorer and fans' favourite Len Shackleton to Sunderland for £13,000.