Prior to joining Orexigen , Narachi , age 50 , served as Chairman , Chief Executive Officer and President of Ren Pharmaceuticals , Inc . , a private biotechnology company and Executive Chairman of the Board of Naryx Pharma , Inc . , a private pharmaceutical company . In 2004 , Narachi retired as an officer and Vice President and General Manager of Amgen 's Anemia Business . Throughout his 20 years at Amgen , Narachi held various positions including : Product Development Team Leader for NEUPOGEN ( R ) ; Director of Clinical Operations in Thousand Oaks , Calif . , and Cambridge , U.K. ; Vice President of Development and Representative Director for Amgen Japan ; Head of Corporate Strategic Planning ; Chief Operations Officer of Amgen BioPharma ; and Vice President , Licensing and Business Development . He is also a director of AMAG Pharmaceuticals , Inc .