logician

noun logician

• philosopher — a person who offers views or theories on profound questions in ethics, metaphysics, logic, and other related fields.
• sophist — (often initial capital letter) Greek History. any of a class of professional teachers in ancient Greece who gave instruction in various fields, as in general culture, rhetoric, politics, or disputation. a person belonging to this class at a later period who, while professing to teach skill in reasoning, concerned himself with ingenuity and specious effectiveness rather than soundness of argument.
• syllogist — a person who engages in syllogistic argument.
• rationalist — the principle or habit of accepting reason as the supreme authority in matters of opinion, belief, or conduct.