1. Brian Biles ( ) is a professor in the Department of Health Policy at the George Washington University, in Washington, D.C.
2. Giselle Casillas is a policy analyst at the Kaiser Family Foundation. At the time the research on Medicare Advantage plans reported here was conducted, she was a senior research assistant in the Department of Health Policy at the George Washington University.
3. Stuart Guterman is vice president, Medicare and cost control at the Commonwealth Fund, in Washington.