In a matter of hours in 1999, Harry Markopolos determined that Bernard Madoff’s returns were not real. Over the course of the next 9 years, Harry and his team assembled a trove of compelling evidence supporting this claim. He spoke to investors and market participants, studied the web of feeder funds that raised capital and built option pricing models that cast doubt that Madoff could achieve anything close to the results he purported to achieve. “How do you have over a 3 Sharpe ratio in finance over many years? You can’t”, Markopolos stated. Ten years post the collapse of the largest Ponzi scheme ever, I am thankful to have had the opportunity to engage with Harry on the various red flags he spotted, the long arc of his pursuit of Madoff and the degree to which investors remain vulnerable to Ponzi schemes and fraud in the current period. I hope you enjoy our wide-ranging, candid conversation.