After serving five terms in the US Senate - including four years heading the Foreign Relations Committee and surviving one unsuccessful run for president, John Kerry became President Barack Obama’s secretary of state in February 2013. Since then, Kerry, a deco-rated Vietnam veteran, has been in near-constant motion, logging more miles than any of his predecessors (1,281,744 at last count).

"The Envoy" is from the November/December 2016 issue of Foreign Affairs.