PASADENA, Calif.--(BUSINESS WIRE)--Arrowhead Research Corporation (NASDAQ: ARWR) today announced that it has appointed Bruce Given, M.D. to the position of Chief Operating Officer of the Company effective October 26, 2011. Since February 1, 2010, Dr. Given has served as Chief Executive Officer of Leonardo Biosystems, Inc., a company in which Arrowhead maintains a minority equity interest, and he also has served as a director of Calando Pharmaceuticals, Inc., a subsidiary of Arrowhead, since October 1, 2009. Additionally, Dr. Given has served on the Board of Directors of ICON, plc since 2004 and was elected Chairman in 2010.