John Newsome Crossley (born 28 September 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, to which he has been connected since 1968. Source: Wikipedia (en)