About the editor STEPHEN J. LIPPARD is Arthur Amos Noyes Professor in the Department of Chemistry at the Massachusetts Institute of Technology. His recent honors include election to the American Academy of Arts and Sciences in 1986, the 1987 Remson Award of the Maryland Section of the ACS, the 1987 ACS Award in Inorganic Chemistry sponsored by the Monsanto Company, a 1988 Humboldt U.S. Senior Scientist Award, and election to the National Academy of Sciences in 1989. Dr. Lippard's research activities span the fields of inorganic and biological chemistry.