Kenneth A. Jackson is Professor Emeritus in the Department of Materials Science and Engineering at the University of Arizona in Tucson, USA. He received his PhD degree from Harvard University and was an assistant Professor there before he joined AT & T Bell Laboratories. At Bell Labs he was head of Materials Physics Research for many years. His major scientific interests are the kinetic processes of crystal growth, and his scientific contributions include constitutional supercooling, the surface roughening transition, defect formation in crystals, and studies of alloy crystallization. He pioneered in computer simulation studies of the atomic scale processes during crystal growth. Kenneth A. Jackson has served as President for both the American Association for Crystal Growth and the Materials Research Society. He has received numerous awards for his scientific contributions from both the American and the International Crystal Growth societies. He is also a member of the National Academy of Engineering.