Jonathan St B. T. Evans (born 30 June 1948)[2] is a British cognitive psychologist, currently Emeritus Professor of Psychology at the University of Plymouth.

[3] In 1975, with Peter Wason, Evans proposed one of the first dual-process theories of reasoning, an idea later developed and popularized by Daniel Kahneman.

[4] Evans began his academic career studying psychology (with a philosophy minor) at University College London in 1966, graduating in 1969 with a first-class honours degree.

[4][5] The same year, he began a Ph.D. on human inference titled "Deductive reasoning and linguistic usage (with special reference to negation)", supervised by Peter Cathcart Wason, which he completed in 1972.

[3][4] Evans helped to establish the journal Thinking & Reasoning and was its editor from 1995 to 2011; he was a member of the editorial board of Psychological Review from 2009 to 2014.