What do these four names mean to you? If you're a serious birder, they mean a lot. These four names are legendary in the field guide world. You might only need to see the first names to know what's up, but your non-birding pals may need to be told: Lars is Mr. Svensson, Kenn is Mr. Kaufman, David Allen is Mr. Sibley, and Roger Tory... well hopefully the father of the modern field guide doesn't really need an introduction. Where would birding be today without the Peterson field guide series?