Question: The lead designer of Dungeons & Dragons co-designed another game published by what company? 
Sentence (from "13th Age"): 13th Age is a d20 fantasy tabletop role-playing game, designed by Rob Heinsoo (lead designer of "Dungeons & Dragons" 4th Edition) and Jonathan Tweet (lead designer of "D&D" 3rd Edition), and published by Pelgrane Press.
Relevant evidence: Yes