Brenner has served at 1-800-CARSEARCH, PromiseMark, and CARFAX; Pributsky joined Zag in 2006 and served at eVox Productions and Malldecker Media; Easterby was most recently at Yahoo!; The firm is backed by Anthem Venture Partners, Capital One Auto Finance, GRP Partners, Arcturus Capital, Callaway Cars and the Skoll Fund. Santa Monica-based Zag, a venture-backed developer of online car buying software, said this morning that it has made a a