John Sabin has been CFO of Revolution LLC, Revolution Growth and Revolution Ventures — the venture firms started by business luminaries Steve Case, Ted Leonsis and Donn Davis — since 2011. The funds have fast grown into a pre-eminent voice for the local and national venture capital community, funding such major D.C.-area brands as CustomInk, Cava Grill, LivingSocial, Optoro and sweetgreen and helping beef up startup communities outside of Silicon Valley.