Hannu Karttunen is a Systems Manager at Tuorla Observatory, University of Turku.
Frank Y. Wang received his Ph.D. in physics from Columbia University in New York, and is currently an assistant professor of mathematics at F. H. LaGuardia Community College of the City University of New York. His research interests include theory of neutron stars and black holes, relativistic mechanics, and high-energy astrophysics. He is an ardent advocate of computer algebra in education and a frequent contributor to the Maple Application Center.