Roger A HornRoger A. Horn was Research Professor of Mathematics at the University of Utah. His publications include Matrix Analysis, 2nd edition (Cambridge, 2012) and Topics in Matrix Analysis (with Charles A. Johnson, Cambridge, 1991), as well as more than 100 esearch articles in matrix analysis, statistics, health services research, complex variables, probability, differential geometry, and analytic number theory. He was Editor of The American Mathematical Monthly (1996-2001), the Mathematics Association of America Spectrum book series (1992-5), and the MAA Carus Mathematical Monographs (2002-5). He has also served on the editorial boards of the SIAM Journal of Matrix Analysis, Linear Algebra and its Applications, and the Electronic Journal of Linear Algebra. Read More Read Less