John Castle served as Chairman of the Board of New York Medical College for 11 years, an institution where he served on the Board of Trustees for 22 years.  He served for five years as a public commissioner and officer of the Joint Commission on Accreditation of Healthcare Organizations (JCAHO), the body that accredits most public and private hospitals throughout the United States. Mr. Castle has also served as a trustee of five different hospitals in the metropolitan New York region, including the New York Presbyterian Hospital where he continues to serve.

Mr. Castle was Chairman of the Columbia Presbyterian Health Sciences Advisory Council and was a member of the Board of The Whitehead Institute for Biomedical Research for 12 years and was the Founding Chairman of the Whitehead Board of Associates. He is a Fellow of the New York Academy of Medicine and has served as a Trustee of the Academy. He was Chairman of the United Hospital Fund of New York’s Capital Campaign and continues as Director Emeritus of the Fund.

Mr. Castle  is also the Chairman of Castle Connolly Medical Ltd. At Castle Connolly, Mr. Castle’s goal, as is the goal of Dr. John Connolly and all the Castle Connolly team, is to publish America’s Top Doctors®, America’s Top Doctors® for Cancer, Top Doctors: New York Metro Area, and other materials as well as build websites to help the public identify the very best in healthcare resources.