Maurice Naftalin is Director of Software Development at Morningside Light Ltd., a software consultancy in the United Kingdom. Maurice consults mainly in object-oriented technologies and teaches Java classes part-time at Learning Tree. He has three decades' experience as a programmer, team leader, and commercial trainer.

Philip Wadler is a professor of theoretical computer science at the University of Edinburgh, Scotland, where his research focuses on functional and logic programming. He co-authored the Generic Java standard that became the basis for generics in Sun's Java 5.0 and also contributed to the XQuery language standard base. Professor Wadler received his Ph.D., in computer science from Carnegie-Mellon University and co-wrote "Introduction to Functional Programming" (Prentice-Hall).