 Eiger BioPharmaceuticals, Inc. Nasdaq:EIGR, a late-stage clinical biopharmaceutical company focused on the development and commercialization of targeted therapies for serious rare and ultra-rare diseases, today announced the appointment of Eldon Mayer as Executive Vice President and Chief Commercial Officer. Mr. Mayer is a pharmaceutical industry veteran with broad commercial experience in large and specialty pharma across multiple therapeutic areas, including both orphan and larger markets, with multiple successful exits by acquisition. 