Answer: logician

AnswerCrossword Clue
LOGICIANHolmes, for one
LOGICIANMr. Spock was one
LOGICIANReasonable person?
LOGICIANSpock, notably
LOGICIANPro at sound reasoning
logicianbranch or variety of logic modal logic Boolean logic
logicianone who is skilled in logic
logicianparticular mode of reasoning viewed as valid or faulty
logicianbranch of semiotics
logiciana science that deals with the principles and criteria of validity of inference and demonstration the science of the formal principles of reasoning
logicianntactics