Dr. Steve Yang has been appointed executive vice president and chief operating officer at WuXi PharmaTech, Inc. Also, Edward Hu will serve as chief investment officer, in addition to his responsibilities as chief financial officer.   Dr. Yang joins the company from AstraZeneca, where he served as vice president and head of Asia and Emerging Markets iMed based in Shanghai. He and his team delivered AstraZeneca’s first preclinical drug candidate discovered in China, and strengthened translat...