Siya man dati nagsirbe bilang Secretary of State for Foreign and Commonwealth Affairs poon 2016 abot 2018 asin komo Alkalde nin London poon 2008 sundo 2016. Si Johnson nangagin  Myembro nin Parlamento (MP) para sa Uxbridge asin South Ruislip poon 2015, asin ugaring nagin nang MP para ki Henley poon 2001 abot 2008.