he broke with Darwin somewhat by promoting the "puctuated equilibrium" theory, which deviated from Darwin's notion of gradual, incremental evolution.
Darwin believed that evolution was likely to happen in fits and bursts - it just got mostly ignored.
Herepton writes:
Gould was the quintessential Darwinist, having wrote Structure of Evolutionary Theory (1000+ pages) and many others defending Darwin tooth and nail.
Amusingly the entire point behind the Structure was summed up in the introduction. Darwin said that many elements of his ideas would be falsified in time, but that the structure of his theory would remain. So it was hardly a book championing Darwin's ideas. Then he spent several pages talking about the difference between 'structures' and 'frameworks' and architecture in general. Its not like all of the book is defending Darwin - its mostly saying he was wrong, but the structure/framework/archway/tree was right.