GREENWICH, Conn.--(BUSINESS WIRE)--W. R. Berkley Corporation’s (NYSE:WRB) Board of Directors today announced that the Company’s founder and its current chairman and chief executive officer, William R. Berkley, will become executive chairman on October 31, 2015. At that time, W. Robert Berkley, Jr. will assume the role of chief executive officer, continuing the transition plan implemented by the Board of Directors when he was appointed president and chief operating officer in 2009. As executive