George Jones, the new CEO of Borders Group, is bringing in Robert P. Gruen as the executive vp of merchandising and marketing. Gruen is filling an open position. As executive vp of marketing, Mr. Gruen will be in charge of the product buying, inventory management, merchandising programs and marketing programs. Gruen has worked with Jones for 18 years in various positions. Kenneth H. Armstrong, another former colleague of Jones, was named executive vp of U.S. stores. Via Shelf Awareness.