The father of diabetes research is Dr. Banting who discovered insulin. His research led to the insulin therapy for patients with diabetes. Here is an interesting blog about him.
http://diabetesdad.org/2014/11/12/this-man-saved-your-your-childs-life-what-do-you-know-about-him/ I hope you have a wonderful day.
Kindest regards,
Fumi Urano