Potter, Wielandt, and Drazin on the Matrix Equation AB = ωBA: New Answers to Old Questions

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Notes on contributors

Olga Holtz

OLGA HOLTZ received her Diploma in applied mathematics from Chelyabinsk State Technical University, Russia, in 1995 and her Ph.D. in mathematics from the University of Wisconsin-Madison in 2000. She is primarily interested in matrix analysis and approximation theory. Her nonmathematical interests include classical piano and voice as well as ballroom dance and ballet. She spent the 2002-2003 academic year at TU Berlin as a Humboldt research fellow and is now an assistant professor at the University of California-Berkeley.

Volker Mehrmann

VOLKER MEHRMANN received his Diplom in mathematics in 1979, his Ph.D. in 1982, and his Habilitation in 1987 from the University of Bielefeld, Germany. He spent research years at Kent State University in 1979-1980, at the University of Wisconsin in 1984-1985, and at IBM Research Center in Heidelberg in 1988-1989. After spending the years 1990-1992 as a visiting full professor at the RWTH Aachen, he was a full professor at TU Chemnitz from 1993 to 2000. Since then he has been a full professor at TU Berlin. His research interests are in the areas of numerical mathematics/scientific computing, applied and numerical linear algebra, control theory, and differential algebraic equations.

Hans Schneider

HANS SCHNEIDER, born in 1927 in Vienna, Austria, left that country rather precipitously to take up the life of a Scottish schoolboy in 1939. In due course, he entered Edinburgh University, obtaining an M.A. (1948) and a Ph.D. (1952) with a thesis on nonnegative matrices under that genius, A. C. Aitken. This led to a lifelong addiction to linear algebra. After seven years at Queen's University, Belfast, he migrated to the University of Wisconsin, and now boasts of being J. J. Sylvester Professor Emeritus. He has published about 140 research papers, joint with about half that many coauthors, and has produced three physical children (joint with his wife Miriam) and seventeen mathematical children, of all of whom he is proud. He was the first president of the International Linear Algebra Society, and his stint as editor-in-chief of Linear Algebra and its Applications is as yet unfinished after thirty-two years. He likes to walk barefoot on Lanikai beach in the light of the full moon and wishes it would happen more often.