RICHARD M. FELDER has authored or co-authored over 100 papers on chemical process engineering and engineering education, and presents seminars, workshops, and short courses on both topics to industrial and research institutions and universities in the United States, Europe, and South America. Since 1990 he has co-directed the National Effective Teaching Institute under the auspices of the American Society for Engineering Education. He has won numerous awards for his contributions to engineering education. RONALD W. ROUSSEAU is Professor of Chemical Engineering at the Georgia Institute of Technology. His teaching and research activities focus on separation and purification, and he has been honored for his work in crystallization. He has published extensively and given lectures and short courses in Asia, Australia, Europe, the Middle East, and throughout the United States. An active promoter of university-industry interactions, lie has served as Chair of the Council for Chemical Research and consultant to more than 50 organizations.