Jakob Nielsen (usability consultant)
Jakob Nielsen (born 5 October 1957) is a Danish web usability consultant, human–computer interaction researcher, and co-founder of Nielsen Norman Group. He was named the “guru of Web page usability” in 1998 by The New York Times and the “king of usability” by Internet Magazine.
Source: Wikipedia — Jakob Nielsen (usability consultant) (CC BY-SA 4.0)