With the proliferation of books that appear annually, it is rare for one to reach the standing of a classic. William K. Gregory's Fish Skulls , originally published in the transactions of the American Philosophical Society in 1933, has had lasting significance and usefulness, rendering it a classic in published ichthyology literature.
William King Gregory (1876–1970) was an American zoologist, renowned as a primatologist, paleontologist, and functional and comparative morphologist. He was an expert on mammalian dentition, and a leading contributor to theories of evolution. In addition he was active in presenting his ideas to students and the general public through books and museum exhibits.