Their journey to create a more user-friendly language began in 1956 with Dartmouth Simplified Code (DARSIMSCO), followed by the Dartmouth Oversimplified Programming Experiment (DOPE).

The current edition of this book, Compilers: Principles, Techniques and Tools (co-authored with Ravi Sethi and Monica Lam), was published in 2007 and remains the standard textbook on compiler design.