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John O'Donnell, OD FAAO, Dipl (Glaucoma), Dipl ABO, has extensive experience in the field of optometry, serving as an optometrist at Premier Eye Care Group since February 1994 and previously at Memorial Eye Institute from January 1983 to February 1993. In addition to clinical practice, John O'Donnell has contributed as an expert witness for DJS Associates, Inc. since December 2019. Earlier in their career, John O'Donnell worked as a cardiopulmonary perfusionist at Penn Medicine from May 1978 to September 1980 and as a nursing assistant at Fox Chase Cancer Center from May 1976 to May 1978. John O'Donnell holds a Doctor of Optometry degree from the Pennsylvania College of Optometry and a Bachelor of Science in Biology from Saint Joseph's University.