William D. Baker has been named vice president of marketing and sales for Gradco Systems Inc.'s printer products. He succeeds Doug Sims, who has left the company. Baker, who has been with Gradco for 6 years, served most recently as director of corporate sales, where he was in charge of sales and marketing for the Venture Engineering and computer software divisions of Gradco. He retains responsibility for those divisions. Gradco, based in Irvine, supplies sorters, sheet feeders and other products to manufacturers of copiers, printers and facsimile machines.