• Clinical Leadership

    With significant experience and expertise, our physician leaders collaborate with other nephrologists to transform kidney care.

Clinical Leadership Team

DaVita-affiliated physicians have access to DaVita’s Office of the Chief Medical Officer (OCMO) physician leaders to collaborate and receive input whenever needed. Dedicated to improving kidney care and the lives of patients, OCMO leaders oversee initiatives such as:

  • Developing a transformative vision of improved health care
  • Collaborating with the nephrologist 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
Clinical Leadership Team

Office of the Chief Medical Officer

Jeffrey Giullian, MD, MBA, FASN

Chief Medical Officer, DaVita Kidney Care

George R. Aronoff, MD, MS, FACP, FASN

Vice President of Clinical Affairs, DaVita Kidney Care

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

Chief Medical Officer, Integrated Kidney Care, DaVita Kidney Care

Steven M. Brunelli, MD, MSCE

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

Partha Das, MBBS, MRCP (Neph), MSc

Chief Medical Officer, DaVita International

Mark R. Kaplan, MD

Vice President, DaVita Medical Affairs

Mahesh Krishnan, MD, MPH, MBA, FASN

Group Vice President, Research and Development

David L. Mahoney, MD

Chief Medical Officer, Lifeline Vascular Access Care

Robert Merrell, MD, FACP

Vice President, DaVita Clinical Risk Support

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

Emeritus CMO, DaVita Kidney Care

Thao Pascual, MD

Chief Medical Officer, Nephrology Practice Solutions

John A. Robertson, MD

Vice President, DaVita Clinical Support Services

David A. Roer, MD, FACP, FAHA, FASN

Vice President, Medical Affairs, DaVita Integrated Care

Martin Schreiber, MD

Chief Medical Officer, Home Modalities

Francesca Tentori, MD, MSCI

Vice President, DaVita Outcomes Research and Patient Empowerment

David B. Van Wyck, MD

Vice President, DaVita Clinical Support Services

Adam Weinstein, MD

Vice President, DaVita Medical Affairs and Clinical IT Services