David Halliday was an American physicist known for his physics textbooks, Physics and Fundamentals of Physics, which he co-wrote with Robert Resnick. Both textbooks have been in continuous use since 1960 and are available in more than 47 languages. Robert Resnick was a physics educator and author of physics textbooks. Jearl Walker is a professor of physics at Cleveland State University. He received his BS in physics from MIT in 1967 and his PhD in physics from University of Maryland in 1973. His book The Flying Circus of Physics has been translated into at least 10 languages. The second edition was published in 2006 and is still being translated into other languages.