Who is Abu Mohammed al-Golani, the leader of the insurgency that toppled Syria’s Assad?

Abu Mohammed al-Golani, the militant leader whose stunning insurgency toppled Syria's President Bashar Assad, has spent years working to remake his public image, renouncing longtime ties to al-Qaida and depicting himself as a champion of pluralism and tolerance. As he entered Damascus behind his victorious fighters Sunday, he even dropped his nom de guerre and referred to himself with his real name, Ahmad al-Sharaa.