Even older digital watches would outperform Stefan Priebsch's first computer. He has been an IT consultant for over 25 years, holds an academic degree in computer science, is the author of several textbooks, and a university lecturer on professional web development. He presents and keynotes at technology conferences around the world. As Co-Founder and Principal Consultant of The PHP Consulting Company, Stefan helps his clients to develop software successfully. He spends his free time playing electric guitar and researching agile home improvement.