Manhattan, New York, U.S.
After working in the healthcare industry for four years, Yang left MMF Systems to join his friend Zeke Vanderhoek at a small test preparation company, Manhattan Prep. In an appearance on the podcast Freakonomics, Yang said he "personally taught the analyst classes at McKinsey, Goldman Sachs, JPMorgan, and Morgan Stanley " during the 2008 financial crisis. In 2006, Vanderhoek asked Yang to take over as CEO. While Yang was CEO, the company primarily provided GMAT test preparation. It expanded from five to 69 locations and was acquired by Kaplan, Inc. in December 2009. Yang resigned as the company's president in early 2012.