PITTSBURGH, Pa. — Angelica Leah Estes of Lisbon graduated from Chatham University on May 22, during the 2011 commencement ceremony held at the Soldiers and Sailors Memorial Hall in Oakland, Pa. Estes graduated with a master of science in biology. This year’s commencement ceremony celebrated the graduation of Chatham’s 139th class of undergraduate women and its 17th class of graduate women and men.