Daniel P. Friedman is Professor of Computer Science at Indiana University and is the author of many books published by the MIT Press, including The Little Schemer (fourth edition, 1995), The Seasoned Schemer (1995), A Little Java, A Few Patterns (1997), each of these coauthored with Matthias Felleisen, and The Reasoned Schemer (2005), coauthored with William E. Byrd and Oleg Kiselyov. Mitchell Wand is Professor of Computer Science at Northeastern University.
I've found the interpreters-based approach for teaching programming languages to be both compelling and rewarding for my students. Exposing students to the revelation that an interpreter for a programming language is itself just another program opens up a world of possibilities for problem solving. The third edition of Essentials of Programming Languages makes this approach of writing interpreters more accessible than ever. --Marc L. Smith, Department of Computer Science, Vassar College