Richard Koch is the bestselling author of The 80/20 Principle, which has sold three quarters of a million copies and been published in thirty-one languages. He is also a highly successful entrepreneur and investor, whose ventures have included Filofax, Plymouth Gin, Belgo and Betfair. He was formerly a partner of Bain & Company and co-founder of LEK Consulting. He has written more than twenty acclaimed books on business and ideas.