“This is a fantastic opportunity to build a leading wealth management business at the world’s most global bank at a time of massive wealth creation worldwide,” Sieg said in a statement. “There is a transformation underway at Citi, and I am excited about becoming part of a team that’s driven to deliver for clients, colleagues and shareholders.” In a memo to employees, Citi CEO Jane Fraser said Sieg is required to take a six-month leave before starting his new role.