I am a general internist and a clinician investigator in health services research focused on improving care delivery for adults with multiple chronic conditions. My research examines physician and other advanced practitioner practice to identify strategies for improving health care outcomes, optimizing access to care, improving patient experience with care, and eliminating potentially avoidable healthcare utilization and the associated costs. The work requires complex linkages of large secondary datasets (e.g., Medicare claims), and the application of quantitative and qualitative methods to study the healthcare workforce and models of care across settings (i.e., hospitals, clinics, skilled nursing and residential care facilities). I have developed and validated claims-based measures of physician practice organization, including a measure of physician specialization in nursing home-based practice. As PI, I have led three NIH-funded R01 studies using mixed methods to evaluate patient outcomes of different physician and nurse practitioner practice models in post-acute care/skilled nursing facilities (PAC/SNF).