Dave Holtz is currently a data scientist at Airbnb. Before Airbnb, he was formerly a data science engineer at Yub, the world's first online-to-offline affiliate network, and he also worked as a product manager and data scientist at TrialPay. Dave holds an M.A. in physics and astronomy from the Johns Hopkins University and a B.A. in physics from Princeton University. In addition to data science, Dave is passionate about cosmology, smart cities, music, theater, and improv comedy.
Cheng-Han worked as a program manager at Microsoft prior to Udacity, and he studied at the University of Texas at Austin and University of California at San Diego for his degrees in computer science.
Outside of work, Cheng-Han is a world traveler. He has lived in Taiwan, Shanghai, Charleston (SC), Dallas, Austin, San Diego, Seattle, and now the Bay Area. In addition to traveling, he likes to find new parks to explore, new venues to visit, and new restaurants to try.