bluebird bio, Inc. announced that Mitchell H. Finer, Ph.D., chief scientific officer, has decided to transition from his current role with bluebird bio over the next six months. At the end of this transition period, he will remain an important scientific voice at bluebird bio by serving on the company's scientific advisory board and continuing to share his experience and insights to benefit the company's scientific strategy. The company is now initiating the process of recruiting for a CSO replacement.