Acusphere, Inc. announced that Mark Leuchtenberger has been appointed President, Chief Executive Officer and a Director of the company, succeeding co-founder Sherri C. Oberg, who will remain on Acusphere's Board of Directors as Vice Chairman. Mr. Leuchtenberger most recently served as President, Chief Executive Officer and a member of the board of directors at Rib-X Pharmaceuticals, bringing experience in commercial operations, business development and preparing biopharmaceutical companies for product approval and commercialization. Prior to joining Rib-X, Mr. Leuchtenberger served as President and Chief Executive Officer of Targanta Therapeutics Corporation, where he led the company's initial public offering in 2007 and its acquisition in 2009.

Mr. Leuchtenberger served as the President and Chief Executive Officer of Therion Biologics Corporation.