Dr. Richard Bernstein, Diabetes Solution. He has a website with great information and several books.
He is himself a Type 1 diabetic who, experimenting on himself, realized that low carb was the ONLY way of eating to control blood sugars. He was at the time an engineer, and went to medical school to get some credibility. He's been a practicing, board-certified endo for years and years, but still has no credibility in the medical establishment!
He not only provides recommendations for eating to control blood sugar, but he explains how specific foods affect the body of a diabetic.