Our Leadership

Executive Leadership

  • Shunichi "Nick" Homma, MD, MHCDS

    • Chief Executive Officer, Columbia Affiliate Physicans
  • Siqin "Kye" Ye, MD, MS, FACC

    • Chief Medical Officer, Columbia Affiliated Physicians
  • Rae Vagg

    • Chief Operating Officer
  • Roger Challop, MD

    • Credentialing Committee Chair
  • Beth Mayers

    • Chief Contracting Officer, Managed Care Contracting
  • Teri Gillette

    • Chief Quality Officer, Quality Division

2023-2025 CAP-IPA Board of Governance

The Board of Governance has broad authority for all major policy issues that govern and affect CAP-IPA.

CAP Provider Representatives

  • Ali Fares Aboufares, MD

    • Clinical Cardiology, cardiac and peripheral vascular intervention at Columbia University Irving Medical Center
  • Raymond Basri, MD, FACP

    • Primary Care, Internal Medicine Specialist
  • Roger Challop, MD

    • Assistant Professor in Clinical Pediatrics; Chair, CAP-IPA Credentialing Committee
  • Adam Geyer, MD

    • Dermatology Specialist at Columbia University Irving Medical Center
  • Jonas Leibowitz, MD

    • Internal Medicine & Endocrinology, Diabetes and Metabolism Specialist
  • Mindy Weiss, MD

    • Internal Medicine Specialist & Founder of Plaza East Medical

CUIMC Provider Representatives

  • Anca Askanase, MD

    • Professor of Medicine, Founder & Clinical Director of Columbia University Lupus Center
  • Samantha Erosa, MD

    • Physical Medicine and Rehabilitation Specialist, Assistant Professor of Rehabilitation & Regenerative Medicine at Columbia University Irving Medical Center
  • Kathleen Hardart, MD

    • Pediatric Specialist, Director of Pediatrics at New York-Presbyterian
  • Nicholas Morrissey, MD

    • Bi-campus Director of Clinical Trials, Division of Vascular Surgery at Columbia University Irving Medical Center
  • Yuri William Novitsky, MD

    • Director of Surgery, Comprehensive Hernia Center at Columbia University Irving Medical Center
  • Michael Jay Pitman, MD

    • Otolaryngology-Head & Neck Surgery Specialist, Director of The Center for Voice and Swallowing; Chief of Division of Laryngology at Columbia University Irving Medical Center