John K. Castle

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John K. Castle
John K. Castle.jpg
John K Castle of Castle Harlan
Personal details
John K Castle

John K. Castle is chairman and chief executive officer of Castle Harlan, Inc.,[1] the chairman of Branford Castle, Inc. and the founder of Castle Connolly Medical Ltd.[2]

Connolly Medical Limited[edit]

Under the auspices of John Castle, two allied companies – Castle Connolly Graduate Medical Ltd and Publishing Works Ltd. – publish study guides for doctors preparing for medical boards and newsletters focused on healthcare. The company also publishes Top Doctors and America’s Top Doctors.[3] Castle Connolly was sold to Everyday Health Group in January 2019.[4][5]


With his expertise in Science, Mathematics and Economics, Castle co-founded the institutional private equity market in the late 1960s.[6] Throughout his career, he has been the owner and controller of the following corporations: Delaware Management, Ethan Allen, Ames True Temper and several restaurant chains (including Perkins, Marie Callender's and Morton's Steakhouses.[7] He has also served as a director of the Equitable Life Assurance Society of the US.

In 1986, he launched Castle Harlan. Prior to that he was president and CEO of Donaldson, Lufkin & Jenrette, Inc.[8] and a director of the Equitable Life Assurance Society of the US.[9]

In 1969 – as chairman of DLJ's Merchant Banking and Sprout Group – Castle was a pioneer in the promotion of the use of limited partnerships as a means for pension funds and other large institutions to invest private capital into companies.[10]

Philanthropy and awards[edit]

In 2015, Castle was the recipient of the 2015 Peter Hilton Founder’s Award.[11] He was the 2017 Happy Warrior Award recipient of The Alfred E. Smith Memorial Foundation.[12]

Castle has endowed one Associate/Assistant Professorship in Economics and five graduate fellowships at The Massachusetts Institute of Technology.[13]


Castle has a Bachelor’s Degree from the Massachusetts Institute of Technology, and an MBA from Harvard Business School where he was a Baker Scholar with High Distinction. He has been awarded four Honorary Doctorate degrees of Humane Letters.[14] One was from Franklin Pierce University.[15]

Palm Beach Residence[edit]

In 1995, Castle purchased and restored the Palm Beach estate formerly-owned by the Kennedy family[16] (best known as John F. Kennedy’s Winter White House). In May 2015, Castle and his wife, Marianne, sold the estate for $31 million to TGS Florida LLC, managed by Jane H. Goldman of New York.[17]

Personal life[edit]

John K. Castle is married to Marianne with whom he has three sons, Dr. James Castle from Highland Park, Illinois, William Castle from Alexandria, Virginia, and John S. Castle.[18]

External links[edit]


  1. ^ Mercedes M., Cardona. "Buy-Out Firm Likes the Traditional Path: Castle Harlan Sticks to Basic Philosophy". Pensions & Investments. Retrieved March 22, 2016.
  2. ^ "Finding the Best Doctors". Retrieved March 22, 2016.
  3. ^ "WHO WE ARE The people behind America's Top Doctors". Castle Connolly. Retrieved March 22, 2016.
  4. ^ Heltzel, Bill (January 21, 2019). "Everyday Health Group acquires Castle Connolly Medical". Westfair Communications. Retrieved March 27, 2019.
  5. ^ "Everyday Health Group Acquires Castle Connolly Medical Ltd., the Leading Healthcare Provider Research and Ratings Company". MarketWatch. Retrieved March 27, 2019.
  6. ^ "Alumni & Friends Profile". MIT Department of Physics.
  7. ^ "John Castle Biography" (PDF). ACG. Retrieved March 22, 2016.
  8. ^ "John K. Castle Elected CEO At Donaldson, Lufkin & Jenrette". Associated Press. Retrieved March 22, 2016.
  9. ^ Gilpin, Kenneth. "BUSINESS PEOPLE; Donaldson Executive Chosen". The New York Times. Retrieved March 22, 2016.
  10. ^ Wayne, Leslie. "The Rise and Fall of the Big Breakup Deals". The New York Times. Retrieved March 22, 2016.
  11. ^ "Q&A Part II – Interview with John K. Castle, Chairman and Chief Executive Officer of Castle Harlan, Inc". ACG New York. Retrieved October 25, 2017.
  12. ^ Krob, Jake. "Castle named a 'Happy Warrior'". Marion Times. Retrieved October 25, 2017.
  13. ^ "Alumni & Friends Profile". MIT Department of Physics. Retrieved October 25, 2017.
  14. ^ John Castle: Advisory Group Member. East West NGO Retrieved March 22, 2016. Missing or empty |title= (help)
  15. ^ "Franklin Pierce University's 2014 Commencement Shines!". Franklin Pierce University. Retrieved March 22, 2016.
  16. ^ "The Kennedys Give up a Beachhead". Bloomberg. Retrieved March 22, 2016.
  17. ^ Bandell, Brian. "Winter White House: Former Kennedy estate in Palm Beach sold for $31M". BizJournals. Retrieved March 22, 2016.
  18. ^ "Wedding Days". New York Social Diary. Archived from the original on March 6, 2016. Retrieved March 22, 2016.CS1 maint: BOT: original-url status unknown (link)