Huh. I'm surprised you never heard of him, what with his colums and advocating webcomics and all kinds of net media stuff for years now. Eisner wrote at least two books about graphic story telling and neither is a complete comic, but there are many illustrations, examples and comic elements since both are more or less practical guides for teaching graphic story telling, and if you don't read or like or understand the graphic parts you won't get much out of the books. It would be pretty useless to just read the text parts or something.

Looking at my copy of "Comics & Sequential Art" it has a handful of pages without illustrations, though two of that are the foreword... otoh it has many pages that are all comic to illustrate points made in the text. I mean, I specificially like them because they were less text heavy than your usual drawing book.