Independent counsel Ken Starr was a special prosecutor appointed to investigate various controversies surrounding President Bill Clinton during the 1990s, most notably the Monica Lewinsky scandal. His investigation initially focused on the Whitewater real estate investments but later expanded to include allegations of perjury and obstruction of justice related to Clinton's extramarital affair. Starr's work played a critical role in the impeachment proceedings against Clinton and raised significant questions about presidential accountability and the limits of executive privilege.