Stephen Kevin Bannon is an American media executive, political strategist, former investment banker, and the former executive chairman of Breitbart News. He served as White House Chief Strategist in the administration of U.S. President Donald Trump during the first seven months of Trump's term.

Bannon was an officer in the United States Navy for seven years in the late 1970s and early 1980s. After his military service, he worked at Goldman Sachs as an investment banker, and left as vice president. In 1993, he became acting director of the research project Biosphere 2. In the 1990s, he became an executive producer in Hollywood, and produced 18 films between 1991 and 2016. In 2007, he co-founded Breitbart News,

In August 2016, Bannon was named the chief executive officer of Trump's 2016 presidential bid. Following Trump's victory, Bannon was appointed Chief Strategist in the Trump administration. He left this position on August 18, 2017 and rejoined Breitbart.

After leaving the White House, Bannon opposed the Republican Party establishment and supported insurgent candidates in Republican primaries. Bannon's reputation as a political strategist was questioned when Roy Moore, with Bannon's support, lost the 2017 United States Senate election in Alabama. Bannon has declared his intention to become "the infrastructure, globally, for the global populist movement." Accordingly, he has supported many national populist conservative political movements around the world.