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Sean Castrina is a serial entrepreneur, having started more than 20 companies over the last 20 years, and still seeks to launch a new venture annually. He is an investor, teacher and highly-sought-after speaker who communicates with humor and a bluntness that engages and captures his audience. He is the author of 8 Unbreakable Rules for Business Startup Success, The Greatest Entrepreneur in the World, and World’s Greatest Business Plan.
