He is a world-renowned authority on visualization, perception, color, and their application in data mining and information retrieval. He is the author of “Color Theory and Modeling for Computer Graphics, Visualization, and Multimedia Applications” (Springer 1997) and co-editor of “Perceptual Issues in Visualization” (Springer 1995), as well as many papers in these subjects. He has more than 35 years experience in teaching and lecturing, and has taught many tutorials and short courses, in addition to regular academic courses.