The Associated Press is reporting that Boston Red Sox General Manager Theo Epstein has resigned:

Red Sox general manager Theo Epstein resigned Monday, surprising Boston and the baseball world just one year after he helped build the franchise’s first World Series championship team since 1918.

The team said in a statement that Epstein will continue working for several days to assist in the transition and prepare for the offseason.

The Boston Herald, which first reported the news on its web site, said the Yale graduate has told associates that he may leave baseball, or at least take a year off.