Dr. Stephen T. Chen has been appointed chairman of the board and chief executive officer of Amarillo Biosciences, Inc. Dr. Joseph Cummins will remain president and become chief operating officer. Dr. Chen has been a director of the company since February 1996. Dr. Chen has more than 30 years of international business experience, including an extensive background in pharmaceutical product acquisition and licensing, development of joint venture agreements, execution of business strategy, and lead...