Kevlin Henney is an independent consultant and trainer based in the UK. His development interests are in patterns, programming, practice and process. He helps teams adopt techniques and improve their software development through training, mentoring and reviewing. He has been a columnist for various magazines and websites. Kevlin is co-author of A Pattern Language for Distributed Computing and On Patterns and Pattern Languages, two volumes in the Pattern-Oriented Software Architecture series. He is also editor of the 97 Things Every Programmer Should Know.