Starbucks will go without a North America CEO after Michael Conway retires in November.Stephen Brashear/Getty ImagesMichael Conway, Starbucks' North America CEO, is retiring in November, without a replacement.Sara Trilling, Starbucks' North American President will lead retail operations in the region.Conway took up the newly created role in April after a leadership restructuring.Michael Conway, Starbucks' North America CEO, is calling it quits after just eight months on the job—and the coffee giant isn't going to replace him.Conway informed the company of his decision last week, according to a Securities and Exchange Commission filing on Monday.Before stepping into the North American CEO role in April, he served as the group president of international and channel development and president of Starbucks Canada.