Recent and dramatic changes in the demand for and reimbursement of psychological services and expertise in health care delivery systems have radical implications for the preparation of psychologists at the predoctoral, internship, and postdoctoral levels. In order to respond to these changes effectively and advance the profession, training programs must realize the expanded and potential role of psychological expertise in evolving health care delivery systems. In this paper, we review several limitations and unfortunate consequences of traditional training programs that have confined the scope of research and practice to the realm of "mental health." We propose that future psychologists be recognized and trained from a broader perspective as "behavioral scientists," prepared to operate at the highest levels of health care delivery systems. Specific recommendations for training and education are discussed.