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A bibliographer, in the technical meaning of the word, is anyone who writes about books. But the accepted meaning since at least the 18th century is a person who attempts a comprehensive account—sometimes just a list, sometimes a fuller reckoning—of the books written on a particular subject. In the present, bibliography is no longer a career, generally speaking; bibliographies tend to be written on highly specific subjects and by specialists in the field. For the bibliographers below, assembling and categorizing books was either a major professional pursuit or a lifelong avocation.

For more information, see the article on bibliography.