Frank J. Wilson

Who He Was

Frank J. Wilson was born in Buffalo, New York, in 1887, and worked as an accountant before joining the U.S. Treasury Department's intelligence unit in 1920. The unit investigated tax crimes, and Wilson became known for studying tax returns and financial records with extreme care. In 1930, he was assigned to lead the effort to prove how much money the Chicago gangster Al Capone was making, since Capone had avoided punishment for years. Instead of chasing Capone through the streets, Wilson followed the money. Working late one night in the fall of 1930, he found an old ledger from a large gambling operation with a small but important line: "Frank paid $17,500 for Al." That clue helped build the tax evasion case that sent Capone to prison in 1931. Wilson later went on to lead the U.S. Secret Service.

Why He Matters

Wilson's investigation is often described as one of the earliest and most famous examples of forensic accounting, using accounting skills to solve crimes. He proved that careful, patient work with numbers could succeed where other approaches had failed. Today, forensic accountants work for the FBI, the IRS, and private companies, uncovering fraud and protecting people's money. Wilson's story shows that accounting can be brave, exciting, and important for keeping communities safe. For students who love a good mystery, he is proof that a sharp eye for detail can crack even the toughest case.