Arno Therapeutics, Inc. announced that Steven D. Rubin, Executive Vice President, Administration and Director of OPKO Health, Inc. has been designated by OPKO Health as a non-voting observer to Arno's Board of Directors, effective immediately. Mr. Rubin has served as Executive Vice President, Administration since May 2007 and as a director of OPKO Health, Inc. since February 2007. Mr. Rubin currently serves on the Board of Directors of Tiger Media, Inc.