WuXi PharmaTech’s chief financial officer, Benson Tsang is leaving the company at the end of February. Edward Hu, chief operating officer, will serve as acting chief financial officer until a replacement is found. Mr. Tsang joined the company in 2006 as chief financial officer and made contributions to the company’s growth and development, including the successful initial public offering in August 2007, enhancement of the company’s financial systems, and relationship buildin...