 She was a post-doctoral fellow in the Decision Sciences and Marketing Departments at the Wharton School at The University of Pennsylvania from 1990-1992, where she conducted research on anchoring with Eric J. Johnson.Chapman was Assistant Professor of Clinical Decision Making in the Department of Medical Education, at the College of Medicine, University of Illinois at Chicago from 1992–1996.From 1993-1996 she worked as a Research Health Scientist in the Health Services Research Department of Veteran Affairs in the West Side Medical Center in Chicago.