A Career Built on Precision
Mark built his career in metrology and forensic science, serving as an expert scientist at the National Institute of Standards and Technology (NIST) and consulting with nuclear, pharmaceutical, forensic, and law-enforcement agencies around the world. Renowned for measurement rigor, he built a reputation for turning complex scientific questions into reliable, defensible results.
A Dangerous Low. A Scientific Question.
While volunteering as a puppy raiser for Guide Dogs for the Blind, Mark - himself an insulin-dependent diabetic - experienced a serious low-blood-sugar episode. It prompted a question that would redirect his life's work:
Could a dog reliably detect a scent associated with blood sugar changes before the change became dangerously low?
— Mark Ruefenacht
Proof, Not Guesswork
Mark brought metrology's discipline to canine scent detection. Through 3 years of self-funded research, he performed controlled studies, training, and validation, establishing that dogs could detect an odor associated with blood sugar changes - and that the scent signature was consistent between insulin-dependent diabetics.
Armstrong Makes History
Mark's own dog, Armstrong, became the first dog in the world scientifically trained and recognized to detect and alert to blood sugar changes in people with diabetes - an achievement recorded in the Guinness Book of World Records.
Dogs4Diabetics Is Founded
Mark founded Dogs4Diabetics, the first medical assistance dog organization accredited by Assistance Dogs International for training and placing service dogs with people living with type 1 diabetes. The program translated a scientific breakthrough into a rigorous, repeatable service-dog model that changed lives.
From Breakthrough to Global Standard
Dogs4Diabetics became a leading standard for diabetic-alert and other medical-alert assistance dogs, with detection reliability exceeding 95 percent accuracy. The work demonstrated that canine medical alerting could be approached with the same expectations for reliability, evidence, and quality that Mark had spent his career applying to measurement science.
That foundation grew into the National Institute of Canine Service and Training (NICST), extending Mark's work beyond diabetes: serving First Responders living with PTSD; conducting ground-breaking cancer-detection research with the UC Davis veterinary and oncology schools; and advising assistance-dog organizations around the world.
The common thread is unmistakable: take an extraordinary canine ability, test it with scientific rigor, build a standard others can trust, and turn it into practical, life-saving help for people.
