bluebird bio, Inc. is a clinical-stage biotechnology company, which engages in researching, developing and commercializing potentially transformative gene therapies for severe genetic diseases. It also offers ZYNTEGLO or beti-cel and SKYSONA or eli-cel gene therapies. The company was founded by Philippe Leboulch and Ronald C. Dorazio on April 16, 1992 and is headquartered in Somerville, MA.