Hub Group said David Yeager, who has been chief executive of the provider of rail-focused freight services for more than a quarter of a century, is retiring and handing the reins to his son, Phillip D. Yeager, on Jan. 1. The Oak Brook, Ill.-based company said Thursday David Yeager, who also has been chairman since 2008, is retiring as CEO but will continue as executive chairman. The succession plans extends the Yeager family leadership of a business founded 51 years ago.