Deutsche Bank AG DB on Wednesday announced a new “leaner” nine-member management board to “further sharpen its focus on clients’ needs, the bank’s areas of growth and operational excellence.” Among the changes, Christiana Riley, CEO for the Americas and management board member, is leaving the bank after May 17 for a new opportunity outside of Deutsche Bank. Chief Administrative Officer Stefan Simon will additionally take over Americas responsibility as of May 18. The team will work to speed up the implementation of the bank’s Global Hausbank strategy. “Against the backdrop of a challenging environment, costs and controls…