He is blind and has strong motivation to undertake and promote research topics relevant to the empowerment of the blind in the information society. His research expertise includes help systems, Web accessibility and usability, human-centered computing, cognitive models, online education, social computing, travel and tourism management, and verbal protocol analysis. He has multiple prior and on-going externally-funded research projects sponsored by the National Science Foundation, European Research Council, and Research Council of Norway. His research appears in multiple peer-reviewed journals and conference proceedings. He is a regular reviewer for multiple journals and international conferences.