Thermo Fisher Scientific has appointed Dion Weisler to its board of directors. Weisler's appointment brings the total number of board members to 12. Currently, he serves as president and CEO of Hewlett-Packard, and also serves on the company's board of directors. He previously served as executive VP of HP's printing and personal systems business. Before joining HP, he served as VP and chief operating officer of product and mobile internet digital home groups at Lenovo.