Bill O'Reilly is an American television host, author, and political commentator, best known for his work on the news program The O'Reilly Factor on Fox News. He gained popularity for his outspoken views on various political and social issues, often engaging in heated debates with guests and critics. O'Reilly has authored several books, including bestsellers like Killing Lincoln and Killing Patton. He has also faced controversy over allegations of sexual harassment, which led to his departure from Fox News in 2017. Despite this, he remains a prominent figure in American media and political discourse.