mathematician
person with an extensive knowledge of mathematics
mental calculator
person with a prodigious ability in some area of mental calculation
statistician
person who works with theoretical or applied statistics
computational scientist
person skilled in scientific computing
numerical analyst
expert of numerical analysis
applied mathematician
mathematician who formulates and solves practical problems in business, government, engineering, and the physical, life, and social sciences
mathematical physicist
scientist in mathematical physics
cryptologist
specialist on cryptology
topologist
mathematician who studies topology
abacist
member of a mathematical school from the Middle Ages (in contrast with an algorithmist)
logician
person specializing in formal logic
geometer
mathematician who studies geometry