David Hauser

David Hauser is a serial entrepreneur, investor, author, and speaker. He co-founded the Grasshopper Group, a virtual phone service that grew to support well over 100,000 entrepreneurs before it was acquired by Citrix for roughly 170 million dollars. He also founded the billing software company Chargify and has gone on to invest in and advise numerous companies. In Unstoppable, Hauser shares the personal transformation that led him to optimize his own health through diet, exercise, and mindset, offering a framework readers can adapt to reach their own peak performance.