Father James Cullen, S.J. (19 April 1867 – 7 December 1933) was born at Drogheda, County Louth, Ireland.
He studied mathematics at the Trinity College, Dublin for a while, but eventually turned to theology and was ordained as a Jesuit on 1 July 1901.
In 1905, he taught mathematics at Mount St. Mary's College in Derbyshire and published his finding of what is now known as Cullen numbers in number theory.
See also 
- Keller, Wilfrid (1995). New Cullen primes. Math. Comp. 64, 1733–1741.
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