An internationally recognized leader in magnetics and computer memory technologies, Emerson W. Pugh is a member of the research staff at the IBM Thomas J. Watson Research Center in Yorktown Heights and author of the widely used text, Principles of Electricity and Magnetism. Lyle R. Johnson is a senior member of the staff at IBM's Thomas J. Watson Research Center. John H. Palmer is a senior member of the staff at IBM's Thomas J. Watson Research Center.