Achillion Pharmaceuticals, Inc. announced that the company’s Board of Directors has elected Nicole Vitullo Chair. Ms. Vitullo is a partner with Domain Associates LLC and has been a member of Achillion's Board of Directors since September 2010. As Chair, she replaces David Scheer, who has served on the Achillion Board since 1998 and was elected Chair in March 2010. Mr. Scheer will remain on the Board of Directors of the Company. Ms. Vitullo serves as a partner at Domain Associates LLC. For more than a decade, Ms. Vitullo was responsible for Domain Public Equity Partners L.P. Ms. Vitullo joined Domain Associates in 1999 and became a Partner in 2004.