"He was a bright star in our galaxy." Larry Horwitz
"After tiring of numerous books which supplied the mathematical basis with little or no physical interpretation, I've finally found this book which really deserves the title "Basic" - it discusses the physical interpretations in a very simple mathematical context, an excellent gateway into the fascinating world of general relativity"
Customer review on his book
"Relativity theory -- concepts and basic principles"
"This is the best review of the physics of stellar evolution that I have ever read. No math but plenty of good solid physics at the advanced undergrduate level. And lots of astronomy.
Excellent for students who wonder what all that math they studied in stellar evolution course is about."
Charles A. Whitney, customer review on his book