expert - a person with special knowledge or ability who performs skillfully

dialectician - a logician skilled in dialectic

syllogiser, syllogist, syllogizer - logician skilled in syllogistic reasoning

Jevons, William Stanley Jevons - English economist and logician who contributed to the development of the theory of marginal utility (1835-1882)

Charles Franklin Peirce, Charles Peirce, Peirce - United States philosopher and logician; pioneer of pragmatism (1839-1914)

Quine, W. V. Quine, Willard Van Orman Quine - United States philosopher and logician who championed an empirical view of knowledge that depended on language (1908-2001)

Bertrand Arthur William Russell, Bertrand Russell, Earl Russell, Russell - English philosopher and mathematician who collaborated with Whitehead (1872-1970)

John Venn, Venn - English logician who introduced Venn diagrams (1834-1923)