The Collaborative International Dictionary of English v.0.48:

man of action \man of action\ n.
   A person who prefers to act rather than contemplate and gets
   things accomplished quickly an efficiently.

   Syn: man of deeds.
        [WordNet 1.5 +PJC]

WordNet (r) 3.0 (2006):

man of action
    n 1: someone inclined to act first and think later [syn: man of
         action, man of deeds]

Moby Thesaurus II by Grady Ward, 1.0:

22 Moby Thesaurus words for "man of action":
   activist, ball of fire, beaver, big-time operator, bustler,
   busy bee, doer, eager beaver, enthusiast, go-getter, human dynamo,
   hustler, live wire, man of deeds, militant, new broom, operator,
   political activist, powerhouse, take-charge guy, wheeler-dealer,
   winner