Dean Mouhtaropoulos/Getty Image
Originally hailed as David Cameron's likely replacement, Johnson said he would not seek the position after his ally, Michael Gove, announced his own candidacy.
But Theresa May ultimately won the position, and she picked Johnson to be the UK's foreign secretary.
Johnson is a clownish character, but he's got enviable popularity levels and is known by his first name across the
Here are some pictures of his life and rise to power.
This article was originally written by Mike Bird and updated by Caroline Simon.