|Full name||William Terrence Hennessey|
|Date of birth||1 September 1942|
|Place of birth||Llay, Wales|
|1980–1981||Tulsa Roughnecks (assistant coach)|
|* Senior club appearances and goals counted for the domestic league only|
William Terrence Hennessey (born 1 September 1942) is a Welsh former international footballer who gained 39 caps for Wales. He played as a defender and made 400 Football League appearances in the 1960s and 1970s with Birmingham City, Nottingham Forest and Derby County.
In November 1965, he was transferred to Nottingham Forest and became their captain. He transferred from Forest to Derby County in February 1970 for a fee of £100,000. His role on the field varied. During his career Hennessey accumulated a total of 400 league appearances, as well as being capped by Wales on 39 occasions.
Hennessey was forced to retire at the end of the 1972–73 campaign and initially went into coaching. After taking a position (for the second time) as an assistant coach of Tulsa Roughnecks in 1980, he took over as manager mid-season in 1981, replacing Charlie Mitchell.
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