Clinical Leadership Team

Clinical Leadership Physicians

Clinical Leadership

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

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
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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
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Brayn N. Becker

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
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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
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Jeffrey Guillian

Jeffrey Giullian, MD, MBA

Chief Medical Officer, Hospital Services
  • Board of Directors Member, Renal Physicians Association
  • Vice Chairman, Healthcare Payment Committee
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Mark R. Kaplan, MD

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