Dolf de Roos, Ph.D., has made millions by building wealth through sound and savvy real estate investments. Generous in sharing his secrets with others, he's a sought-after-speaker, presenting seminars across the globe. He is also the author of five bestselling property books, including the "New York Times" bestseller "Real Estate Riches." What's more, Dolf launched a public company, Property Ventures Limited, of which he is the chairman. And, he was handpicked to be an adviser for Trump University.