As a psychologist I am originally specialized in information ergonomics also called cognitive ergonomics. Cognitive ergonomics is the study of the way in which people perceive, process, remember, and take decisions based on information using senses as vision, hearing and touch.
Knowledge from the field of cognitive ergonomics can help to develop machines, systems and software, not in the least websites, in such a way that they can be optimized for the people that use them. One of the applications in this field is called interaction design.
From my specific working experience in the area of ergonomical analysis en development of user interfaces I could contribute in optimizing your website or web applications.