Who is doing the most promising research for an Alzheimer's cure?

It's hard to say. Scores of research teams around the world are racing to find a cure for Alzheimer's disease; the central problem is that we're not yet sure exactly what causes the disorder in the first place. Until the disease process is understood, a cure per se can't be implemented. Given the probability that there are a variety of factors at play, both genetic and environmental (habits, general health, etc.) some scientists don't believe we will see a one-size-fits-all "cure." This is part of the reason there's a major push toward both prevention (because we do understand some of the factors that raise one's risk of Alzheimer's) and treatment (because millions of people are living with the disease and will continue to develop it before a cure is introduced). While a cure would obviously be an incredible and monumental development, it's unfortunately not likely to be a headline we'll be reading about in the foreseeable future.