Katie Merrell, B.A., is a senior research scientist at Social & Scientific Systems. She received her B.A. in mathematics and economics from Amherst College. Since joining the staff of the Physician Payment Review Commission in 1990, Ms. Merrell has done extensive work in the area of physician payment policy and other aspects of physician compensation, organization, and training. In addition to this research, Ms. Merrell has led studies of Medicaid managed care and evaluations of several maternal and child health initiatives. She was affiliated with the University of Chicago for 17 years, where, in addition to performing research, she taught master’s-level courses on the health care system and data analysis.