GREENWICH, Conn.--(BUSINESS WIRE)--W. R. Berkley Corporation (NYSE: WRB) today announced the appointment of Ryan Miller as president of Berkley Southeast. The appointment is effective immediately. Mr. Miller has more than 25 years of progressive leadership experience in commercial insurance operations, underwriting, and field management. He most recently served as senior vice president and chief field operations manager at a large, regional carrier with accountability for growth, profitability,.