James Leon Gregory Callaghan 
Location served:
Years in Practice:
1935 to 0
Area of Specialization:


Dr. James Leon Gregory Callaghan was born in Middlesex County on December 4th, 1902.  His parents were James Joseph Callighan and the former Margaret Ellen Hoolihan. He had an older brother named Vincent Ambrose Callaghan who was born on November 20th, 1900 and a younger sister was born on the 19th of March, 1904. Dr. Callaghan was educated at St. Peter’s Roman Catholic Separate School and High School in London, Ontario. He attended the University of Western Ontario in London and obtained a Bachelor of Arts degree with honors in science in 1925, then his M.D. from the U.W.O. Medical School in 1928.

In a Declaration of Intention with the United States of America completed by Dr. Callaghan on the 13th of June, 1928, Dr. Callaghan recorded his address as 293 Rowena St., Detroit, Michigan.  Dr. Callaghan interned in New York City, then he was a chief resident intern at Victoria Hospital in London, Ontario for two years. He was certified in Diagnostic Radiology by the Royal College of Physicians and Surgeons in Canada.

Dr. Callaghan married Anne Regina Madden of North Tarrytown, New York and they had two children, a daughter and a son.  Mrs. Callaghan was a nurse.

Dr. Callaghan practiced medicine at Kirkland Lake until May of 1946 when he moved to become a radiologist at St Joseph’s Hospital in Chatham, specializing in diagnostic radiology.  In 1949, Dr. Callaghan was the President of the Kent County Medical Society.  In 1967 he was the Chief of Radiology at St. Joseph’s Hospital.  Dr. Callaghan served as the Chairman of the Roman Catholic Separate School Board of Chatham. In his spare time, he enjoyed photography, fishing and travelling.

In the early 1970’s Dr. Callaghan was living in London.  Dr. Callaghan’s brother Vincent also became a physician and he practiced in London and he as a faculty member at the University of Western Ontario.

*Dr. Callaghan’s son, Dr. James E. Callaghan also became a radiologist.