Douglas J ShawDouglas Shaw received his M.S. from the University of Illinois and Ph.D. from the University of Michigan. He was a visiting professor at the University of Minnesota, and is currently at the University of Northern Iowa. His research is in combinatoric, number theory, and tertiary mathematics education. He has written instructor's guides for Brooks/Cole and worked on many other ancillaries as well. When he took Abstract Algebra in graduate school, he used one of Thomas Hungerford's texts and never sold it back to the bookstore. Read More Read Less