Alfred RennaBefore Barbara Corcoran, of Shark Tank, sold The Corcoran Group, Alfred Renna helped catapult them into one of the most powerful real estate companies in the world, spearheading a team to build a website that became the archetype for today's most poplar real estate sites. Since then, he moved to Douglas Elliman and, as Executive Manager of Sales, helps hundreds of brokers brand and market themselves, turning many into millionaires. Read More Read Less