At My Own Pace, the compelling, delightful, and educational autobiography of Fred S. Keller is a vital book for anyone interested in behavioral science. Keller's versatile body of work included devising methods for Morse Code operators during World War II, teaching the first undergraduate course in psychology using Skinner's experimental methods, developing the Personalized System of Instruction (PSI), delivering behavior analysis to Brazil and other countries, and writing several important psychology texts. He describes the evolution of these contributions and illuminates the roles of B. F. Skinner, Nat Schoenfeld, and many others with whom he interacted. At My Own Pace is a must-have book for the library of every behavior analyst.