Roughly 54 million people with disabilities live in the U.S., and there are many more millions of people with disabilities around the world. Not surprisingly, differences among people with disabilities are often as notable as differences between people with and without disabilities. And, while the lack of homogeneity among people with disabilities makes creating a valid taxonomy under this term difficult if not impossible, there is commonality among people with disabilities that justifies an authoritative resource on positive psychology and disability; that is, they have experienced...