Taxonomist n. : One skilled in taxonomy.

Example:
What is the name of a modern day Taxonomist?

Taxonomy
taxonomy, folk taxonomies, car, ranks, taxa, subtype, relationships, vehicle, supertype, free encyclopedia, Biological classification, alpha taxonomy, taxonomic scheme, constraints, hierarchies, taxonomic ranks, traits, similarity.

Defination from the web:
... The word finds its roots in the Greek τάξις, taxis (meaning 'order', 'arrangement') and νόμος, nomos ('law' or 'science' ...