What is "icefrog"

IceFrog is a video game designer, best known for being the longest-serving designer of DotA ( Defense of the Ancients), a custom Warcraft III: Reign of Chaos mod - and as the lead designer for the stand-alone sequel, Dota 2.

His involvement with Defense of the Ancients originally began in 2005, when he inherited the reins of the dominant variant entitled DotA Allstars from "Neichus", who himself inherited it from Steve "Guinsoo" Feak.

IceFrog is noted for his continued anonymity, having never publicly disclosed his actual name; but in February 2009 revealed on his blog that he was 25 years old at the time.