Jakob Nielsen is Principal of Nielsen Norman Group (www.nngroup.com), a user experience firm he co-founded with Donald A. Norman in 1998. Nielsen is the founder of the "discount usability engineering" movement, which emphasizes fast and efficient methods for improving the quality of user interfaces. As part of this effort he co-invented the heuristic evaluation method. Nielsen is the author of the best-selling book Designing Web Usability: The Practice of Simplicity, which has sold more than a quarter of a million copies in 22 languages. His other books include Usability Engineering, Usability Inspection Methods, International User Interfaces, Homepage Usability: 50 Websites Deconstructed, Prioritizing Web Usability, Eyetracking Web Usability, and Mobile Usability. Nielsen’s Alertbox column on web usability has been published on the Internet since 1995 and has received a cumulative 175 million pageviews. From 1994 to 1998, Nielsen was a Sun Microsystems Distinguished Engineer. His previous affiliations include Bell Communications Research (Bellcore), the Technical University of Denmark, and the IBM User Interface Institute at the T.J. Watson Research Center. He holds 79 United States patents, mainly on ways of making the Internet easier to use.