Charlie Tian, PhD, is the founder and CEO of the value-investing website GuruFocus.com. He is the creator of the website's value screeners, strategies, and research tools, which are used by more than half a million investors monthly and by professors and students in more than 100 universities worldwide. Dr. Tian has been featured in Fortune, Forbes, and Barron's. In his life prior to GuruFocus, he was a physicist and the inventor of more than 30 U.S. patents.