John Crossley

John Crossley (16 May 1812 – 16 April 1879) was a Liberal Party politician in the United Kingdom. He served from 1874 to 1877 as MP for Halifax in West Yorkshire.

He was the eldest son of John Crossley (1772–1837) and his wife Martha Turner. Crossley was a successful carpet manufacturer, whose business (John Crossley and Sons) became a major employer in Halifax. He was the elder brother of Sir Francis Crossley (1817–1872), who had served as the constituency's MP from 1852 to 1859.

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John Newsome Crossley

John Newsome Crossley, DPhil, MA (Oxon), (born 1937, Yorkshire, England) is a British-Australian mathematician and logician who writes in the field of logic in computer science, history of mathematics and medieval history. He is involved in the field of mathematical logic in Australia and South East Asia.

As of 2010, Crossley is Emeritus Professor of Logic at Monash University, Australia where he has been connected since 1968. Crossley studied at Oxford University where he received his DPhil and MA (Mathematics) in 1963. His early career was spent at Oxford where he was the first university lecturer in mathematical logic and was a Fellow of All Souls College, Oxford. He is still a Quondam Fellow there. He was offered a Readership position and following a lecturing visit to Monash University in 1968, he was elected to a Chair in Pure Mathematics. He accepted this position and as of 2010, Crossley continues to be active at Monash University where he serves through its Faculty of Information Technology.