Steven Zelenkofske has joined Achillion Pharmaceuticals (NASDAQ: [[ticker:ACHN]]) as executive vice president and chief medical officer of the New Haven, CT, drug developer. Zelenkofske most recently worked at uniQure (NASDAQ: [[ticker:QURE]]), where he was chief medical officer. He has also held leadership positions at Regado Biosciences, AstraZeneca (NYSE: [[ticker:AZN]]), Sanofi-Aventis, Boston Scientific (NYSE: [[ticker:BSX]]), and Novartis (NYSE: [[ticker:NVS]]). Achillion develops drugs to treat rare immune disorders.