Jakob Nielsen is a Danish computer scientist and usability engineer who is recognized as one of the pioneers of user experience (UX) design. He is the co-founder of Nielsen Norman Group, a leading UX consultancy firm. Nielsen is also a prolific author, having written numerous books on usability and web design, including "Designing Web Usability," which is considered a seminal work in the field. He is known for his strong opinions on usability and often advocates for designing products that are easy and intuitive to use. Nielsen has also been recognized with numerous awards for his contributions to the field of usability.