VLADIMIR P. KRAINOV of the Moscow Institute of Physics and Technology has long been involved in examining the fundamentals of the interaction of strong fields with atoms. He is the coauthor of three books on this subject. HOWARD R. REISS of American University in Washington, D.C. is one of the originators of intense-field investigations. He has developed basic nonperturbative methods and applied them to atoms, as well as to nuclei, elementary particles, and condensed-matter systems. BORIS M. SMIRNOV heads a division of the Institute for High Temperatures of the Russian Academy of Sci...