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Nielsen's earlier affiliations include Bellcore (now Telcordia Technologies) (Bell Communications Research), the Technical University of Denmark, and the IBM User Interface Institute at the Thomas J. Watson Research Center.
From 1994 to 1998, he was a Sun Microsystems Distinguished Engineer. He was hired to make heavy-duty enterprise software easier to use, since large-scale applications had been the focus of most of his projects at the phone company and IBM. But luckily the job definition of a Distinguished Engineer is "you're supposed to be the world's leading expert in your field, so you figure out what would be most important for the company for you to work on." Therefore, Dr. Nielsen ended up spending most of his time at Sun defining the emerging field of web usability. He was the usability lead for several design rounds of Sun's website and intranet (SunWeb), including the original SunWeb design in 1994.
Nielsen is on the editorial board of Morgan Kaufmann Publishers' book series in Interactive Technologies.
Nielsen writes a fortnightly newsletter, Alertbox, on web design matters and has published several books on the subject of web design. After his regular articles on his Web site about usability research attracted media attention, he co-founded usability consulting company Nielsen Norman Group with fellow usability expert Donald Norman.
Nielsen founded the "discount usability engineering" movement for fast and cheap improvements of user interfaces and has invented several usability methods, including heuristic evaluation. He holds 79 United States patents, mainly on ways of making the Web easier to use.
Nielsen gave his name to Nielsen's Law, in which he stated that network connection speeds for high-end home users would increase 50% per year, or double every 21 months. As a corollary, he noted that, since this growth rate is slower than that predicted by Moore's Law of processor power, user experience would remain bandwidth-bound.
Nielsen has also defined the five quality components of his "Usability Goals", which are:
Nielsen has been criticized by some graphic designers for failing to balance the importance of other user experience considerations such as typography, readability, visual cues for hierarchy and importance, and eye appeal.
Nielsen has been quoted in the computing and the mainstream press for his criticism of Windows 8's user interface. Tom Hobbs, creative director of the design firm Teague, criticized what he perceived to be some of Nielsen's points on the matter, and Nielsen responded with some clarifications. The subsequent short and troubled history of Windows 8, released on October 26,2012, seems to have confirmed Nielsen's criticism: the sales of Windows-based systems plummeted after the introduction of Windows 8; Microsoft released a new version, Windows 8.1, on Oct 18,2013, to fix the numerous problems identified in Windows 8, and later released Windows 10, a complete overhaul, in July 2015.
Nielsen's 2012 guidelines that web sites for mobile devices be designed separately from their desktop-oriented counterparts has come under fire from Webmonkey's Scott Gilbertson, as well as Josh Clark writing in .net magazine, and Opera's Bruce Lawson, writing in Smashing Magazine, and other technologists and web designers who advocate responsive web design. In an interview with .net magazine, Nielsen explained that he wrote his guidelines from a usability perspective, not from the viewpoint of implementation. However, Nielsen appears to have ignored the emerging software technology related to responsive web design, whereby a single body of code, while requiring more painstaking implementation, can be run on devices of various screen sizes, from mobile screens to desktop monitors.
His published books include:
A list of Jakob Nielsen's research publications is maintained at Interaction-Design.org
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