Niccol, who previously led Taco Bell, moved Chipotle's headquarters from Denver to Newport Beach when he took over the burrito behemoth in 2018. Niccol is the fourth CEO at Starbucks in the past two years. He replaces Laxman Narasimhan, who was under scrutiny as Starbucks has dealt with declining sales and increasing activist investor campaigns. Starbucks' stock was up more than 20% following the announcement of Niccol's new role. He starts at Starbucks Sept. 9.