Dempsey was educated at Holy Family School, Mossend, the Co-operative College in Loughborough, and at the National Council of Labour Colleges. He was a clerk with a haulage firm and a councillor on Lanarkshire County Council from 1945. He later worked as a lecturer on political economy and a writer on local government.
- Leigh Rayment's Historical List of MPs – Constituencies beginning with "C" (part 5)[self-published source][better source needed]
- Times Guide to the House of Commons, 1966 & 1979
- Hansard 1803–2005: contributions in Parliament by James Dempsey
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|Member of Parliament for Coatbridge and Airdrie
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