Howard Marks (born Dennis Howard Marks on 13 August 1945) is a Welsh author and former drug smuggler who achieved notoriety as an international cannabis smuggler through high-profile court cases. At his peak he was supposedly smuggling consignments of the drug as large as 30 tons, and was connected with groups as diverse as the CIA, the IRA, MI6, and the Mafia. He was eventually convicted by the American Drug Enforcement Administration and handed a 25-year sentence to be served at Terre Haute; he was released in April 1995 after serving seven years. Though he had up to 43 different aliases, he became known as Mr Nice, after he bought a passport from convicted murderer Donald Nice.