David Hauser is an American entrepreneur, speaker, and angel investor, best known for co-founding the Grasshopper Group, a virtual telephone service that was acquired by Citrix Systems for $170 million in 2015. He is also a founding member of the National Entrepreneurs’ Day and has co-founded several tech companies, including Grasshopper, Chargify, Spreadable, PopSurvey, and Deck Foundry.