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A native of Arosa, Switzerland, Gahwyler studied internal medicine in Lausanne and Geneva.
He moved to the U.S. after World War II and continued to work as a physician, as well as developing a long-term career at Pfizer and American Home, where he worked in antibiotic research and world-wide marketing.
He authored a series of three books, collectively known as "The Competitive Edge," which helped horse riders understand the fundamentals of equine physics and how to improve horse rider performance.
Gahwyler was a national and internationally recognized dressage judge, and spent many years judging at the highest levels in the U.S. and abroad.
He was part of a small group that worked with Margarita Serrell to establish the American Dressage Institute, a forerunner to the United States Dressage Federation.
He served as president in the formative years of the A.D.I., and earned a place in the U.S. Dressage Federation Hall of Fame.
Gahwyler is survived by his wife, Doris Gahwyler, who shared his love of animals.
A memorial service will be held at 10 a.m. on Friday, June 3, at St. Luke's Episcopal Church, 1864 Post Road, in Darien.
Donations can be made to Visiting Nurse and Hospice of Fairfield County or H.O.R.S.E. of Connecticut.
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