Robert Mazur is a former government agent who investigated drug-money laundering for the US Drug Enforcement Administration, the Internal Revenue Service intelligence division, and the Customs Service. While deep undercover in hot spots such as Florida, Colombia, and Panama, Mazur successfully infiltrated criminal rings and cartels, including Pablo Escobar's, by posing as a wealthy, mob-connected businessman. He helped manage the illicit fortunes of the Medellín and Cali cartels while gathering evidence that would lead to some of the largest money-laundering prosecutions in history. He speaks to Insider about how the cartels layer their assets, and move money via "smurfs". He also covers the use of legitimate businesses, such as jewellery chains and mortgage brokerage companies. Mazur is the author of "The Infiltrator," which became a New York Times bestseller and inspired a 2016 film of the same title, starring Bryan Cranston (as Mazur) and John Leguizamo. Cranston is set to play Mazur again in the sequel currently in development, which is based on Mazur' second memoir, "The Betrayal."