pragmatist

One who acts in a practical or straightforward manner; one who is pragmatic; one who values practicality or pragmatism.

One who acts in response to particular situations rather than upon abstract ideals; one who is willing to ignore their ideals to accomplish goals.

One who belongs to the philosophic school of pragmatism; one who holds that the meaning of beliefs are the actions they entail, and that the truth of those beliefs consist in the actions they entail successfully leading a believer to their goals.

(politics) An advocate of pragmatism.

(linguistics) one who studies pragmatics.