Ellen Finkelstein is the bestselling author of How to Do Everything with PowerPoint 2003 and PowerPoint 2000 Professional Results and writes for Presentations magazine.
Retherford's book...is like a tour to the top of a mountain. Every step is devoted to the final goal, the trace formula...the book is written in a style which reveals the author's enthusiasm. Thus it could be good prpaganda for functional analysis...this is a remarkable book which forces the student to understand mathematics and to be careful. A. Pietsch, Mathematical Reviews