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This author's biographical information suggests that he has all the characteristics of a recognized expert in his field and a credible author on the topic of Web usability. His advanced degree, work experience, patents, publications, and press coverage all demonstrate that he is qualified to write on the topic.
Further links to a publication and patent list, interviews and press coverage, and public presentations provide additional evidence of his credibility as an author. Finally, a quick investigation using a search engine reveals that he regularly publishes material on this topic and that his material is regularly cited by other authors in the field. http://www.useit.com/jakob/ 
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