Dr. Stiff is a Professor of Mathematics Education and an associate member of the math department. As such, he has taught courses in mathematics and mathematics education, including uses of technology in teaching mathematics, and the mathematics education of African-American children. Dr. Stiff's research and other professional activities have focused on teaching strategies, problem solving, the mathematics education of African-American children, and uses of instructional technologies in mathematics teaching. His research methodologies include experimental design, surveys and interviews, and classroom-based investigations.