'Creating something from nothing is a daring act. Tom's wisdom and encouragement will give any reader the confidence to take the leap.' Eric Ries bestselling author of The Lean Startup ________________. 90% of start-ups fail. But why? And is there a way to avoid the common pitfalls when you start your own business?. Over the past 23 years at Harvard Business School Tom Eisenmann has helped launch thousands of startups. An astonishing 13 of these have reached unicorn status