The late Dr. Gfeller was a leading and long-standing veterinary emergency practician in Fresno, California. He passed away in an automobile accident in 2007, and the update to his First Aid series was done as a memorial to him.

A 1973 graduate of Kansas State University School of Veterinary Medicine, Dr. Gfeller was practicing emergency medicine nearly as long as anyone in the country and had been a Board Certified Diplomate of the American College of Veterinary Emergency and Critical Care since 1993.

Dr. Gfeller supervised treatment of over 100,000 emergency cases. He lectured to local, national, and international audiences on emergency medicine and critical care.