Rocknocker: A Geologist's Memoir reviews the life of George Devries Klein, an immigrant who made it through the American System as a geologist. It chronicles his life from early childhood, graduate school, working as an oil company researcher, university professor, science administrator, and as a geological consultant. The book includes the highs and lows of George's life. Each chapter also summarizes key lessons learned making the book even more useful to young scientists as a career guide. Isolated incidents relevant to the book, but shortened, are included as postscripts at the end of each chapter. A highly informative read that shows what is needed to develop a productive career in the sciences.