Allen is a world-class programmer and software architect. He's built full-stack web applications, micro-services, compilers, database servers, real-time operating systems, and more.
Allen is one of the most respected teachers in the industry. As an expert practitioner, he brings a solid practical focus to his classes that's missing from most “training.” Popular classes include Swift Programming and the Agile/OO-Design Workshop.
Allen speaks internationally on subjects ranging from agile process to nuts-and-bolts programming. His keynotes are always thought provoking and well received.
Allen is widely published (a dozen books, hundreds of magazine articles and blog posts).