The creator of DotA (Allstars, the most popular incarnation)[0] works for Riot on League of Legends. The guy at Valve[1] inherited it. The creator of the original DotA also works at Valve, but he came and went long before Allstars blew up. (He actually stopped working on DotA to create a sequel, Thirst for Gamma, which was truly awful and never made it out of the gate.)
>The creator of DotA (Allstars, the most popular incarnation)[0] works for Riot on League of Legends. The guy at Valve[1] inherited it.
I would argue that Icefrog's version was the most popular incarnation. It may have started off as simply an inheritance of Allstars, but Icefrog is the one that actually balanced it and made it something that was competitive. The popularity skyrocketed after Icefrog took over for Guinsoo.
[0] http://en.wikipedia.org/wiki/Steve_Feak [1] http://en.wikipedia.org/wiki/IceFrog