Clinical Leadership Team

The DaVita Patient-Focused Quality Pyramid, clinical initiatives—such as fluid and infection management—and other innovations that support clinical excellence were created and driven by these physician leaders, with group medical directors and physician partners, who have dedicated themselves to raising the standard of care for patients with kidney disease. They are shaping the future of kidney care by:

  • Developing a transformative vision of improved healthcare
  • Collaborating with a widespread physician community
  • Taking accountability for improving results
  • Addressing challenging clinical topics
  • Investing in physician development across all levels
  • Striving for a high level of physician satisfaction
DaVita Clinical Leadership Team

Office of the Chief Medical Officer

Allen R. Nissenson, MD, FACP, FASN, FNKF

Chief Medical Officer, DaVita Kidney Care

  • Emeritus Professor of Medicine, David Geffen School of Medicine
  • Co-Chair, Kidney Care Partners Quality Initiative

George R. Aronoff, MD, MS, FACP

Vice President of Clinical Affairs, DaVita Kidney Care

  • Former CEO, Renal Ventures Management
  • Former faculty, Indiana University School of Medicine

Bryan N. Becker, MD, MMM, FACP, CPE

Chief Medical Officer, Integrated Kidney Care, DaVita Kidney Care

  • Former President, National Kidney Foundation
  • Former CEO, University of Illinois Hospital and Clinics

Steven M. Brunelli, MD, MSCE

Vice President and Medical Director, DaVita Health Economics and Outcomes Research

  • Former Faculty, Harvard Medical School and Brigham and Women’s Hospital
  • Former Member, American Society of Nephrology’s Dialysis Advisory Group

Jeffrey Giullian, MD, MBA

Chief Medical Officer, Hospital Services

  • Board of Directors Member, Renal Physicians Association
  • Vice Chairman, Healthcare Payment Committee

Mark R. Kaplan, MD

Vice President, DaVita Medical Affairs

  • Former Chief Medical Officer, DSI Renal, Inc.
  • Former Vice President, Fresenius Medical Care

Mahesh Krishnan, MD, MPH, MBA, FASN

Chief Medical Officer, DaVita International

  • Group Vice President, Research and Development
  • Former Medical Director and Global Development Leader, Epogen at Amgen

David L. Mahoney, MD

Chief Medical Officer, Lifeline Vascular Access

  • Former group medical director, DaVita Kidney Care
  • Former Army physician

Robert Merrell, MD, FACP

Vice President, DaVita Clinical Risk Support

  • Private Practice Nephrologist, Kidney Specialists of Southern Nevada
  • Former Medical Director, DaVita Kidney Care centers

Robert Provenzano, MD, FACP, FASN

Chief Medical Officer, Nephrology Practice Solutions & Vice President, Medical Affairs

  • Clinical Professor of Medicine, Wayne State University School of Medicine
  • Former President, Renal Physicians Association

John A. Robertson, MD

Vice President, DaVita Clinical Support Services

  • Physician Council Member, DaVita Kidney Care
  • Founder and Partner, Nephrology Associates Medical Group, Inc.

David A. Roer, MD

Vice President, Medical Affairs, DaVita Integrated Care

  • Associate clinical professor, Yale School of Medicine
  • Previous Chief of Nephrology, St. Mary's Hospital

Martin Schreiber, MD

Vice President, DaVita Clinical Affairs—Home Dialysis

  • Former Chairman, Cleveland Clinic Department of Nephrology and Hypertension
  • Former Director, Cleveland Clinic Home Dialysis

Francesca Tentori, MD, MSCI

Medical Director, DaVita Outcomes Research and Patient Empowerment

  • Former research scientist, Arbor Research Collaborative for Health
  • Former assistant medical director, Dialysis Clinic Inc.

David B. Van Wyck, MD

Vice President, DaVita Clinical Support Services

  • Emeritus Professor of Medicine and Surgery, University of Arizona College of Medicine
  • Former Co-Chair, National Kidney Foundation Kidney Disease Outcomes Quality Initiative Anemia Workgroup

Adam Weinstein, MD

Vice President, DaVita Medical Affairs—Clinical IT Services

  • AMA RUC advisor, Renal Physicians Association
  • Former VP of medical affairs, University of Maryland, Shore Regional Health