Career
He also represented the English national team at both the 1950 and 1954 World Cup. Mullen joined the Midlanders in June 1937, turned professional on his 17th birthday, and remained with the club until his retirement in May 1960. He also played for England, earning 12 caps (3 wartime).
He also played in the 1950 Fédération internationale de football association World Cup and the 1954 Fédération internationale de football association World Cup.
He scored 6 goals, including in the 1954 World Cup against Switzerland. During wartime, he served as a soldier in the Army from 1942 onward, based at Farnborough, Catterick and Barnard Castle.
After retiring from football, he ran a sports shop in Wolverhampton until shortly before his death.