Dr. John Hubbell is the Chief of Anesthesiology at the Rood and Riddle Equine Hospital in Lexington, Kentucky, and holds the title Professor Emeritus of Veterinary Clinical Sciences at The College of Veterinary Medicine of The Ohio State University. Dr. Hubbell has been a Diplomate of the American College of Veterinary Anesthesia and Analgesia since 1982.

Dr. Hubbell was raised in Lima, Ohio, in a pet and horse owning family. After receiving his DVM from Ohio State in 1977, he served an equine surgery internship at the University of California at Davis then returned to Ohio State as a resident in veterinary anesthesiology. Dr. Hubbell was a faculty member at Ohio State from 1982 until 2015 when he joined Rood and Riddle.

Dr. Hubbell is author of numerous articles on veterinary anesthesia and coauthor of two textbooks: Handbook of Veterinary Anesthesia and Equine Anesthesia Monitoring and Emergency Therapy. Dr. Hubbell is an active member of the American Association of Equine Practitioners and speaks frequently at the annual meeting on topics related to anesthesia.

Mark is a European Specialist in Veterinary Anaesthesia and Analgesia and is an RCVS recognised specialist in Veterinary Anaesthesia and Analgesia. 

Mark graduated from the University of Liverpool in 1997 and then spent 2 years working in mixed practice. He returned to the University of Liverpool to complete a Residency in Equine Anaesthesia and Cardiology between 1999-2002 and was then appointed Lecturer in Veterinary Anaesthesia in 2004. He holds the RCVS Certificate in Veterinary Anaesthesia and is a Diplomate of the European College of Veterinary Anaesthetists. Mark was also awarded a PhD for his thesis ‘Complement and Endotoxin in Equine Colic’ in 2009.

Mark is a member of the editorial consultant board for the 'Equine Veterinary Journal'. Mark is head of the equine anaesthesia service in the equine hospital and is also Hospital Director.

Mark has two horses and a pony at home on his smallholding in North Wales.