Career
Haslam played for Rochdale as an amateur, before moving to Oldham Athletic in 1946-1947, for whom he made two League appearances. After a short spell with Brighton & Hove Albion he moved to Leyton Orient for 1948-1949, with whom he made 7 League appearances, before joining Guildford City. He managed Tonbridge in the 1960s, winning the Kent Senior Cup in 1964-1965, and went on to manage the club on a record 552 occasions.
Haslam became manager of Luton Town in 1972 and he led them to promotion to the Football League First Division for 1974-1975.
In 1978 he became manager of Sheffield United, and he remained in charge until 1980.