The author has been working as a product manager and agile coach (Scrum, Lean Startup, Lean Change) for many years. During that time he developed B2C as well as B2B software, mainly for startups, including a former Google subsidiary. He originally studied chemistry, business administration and law. However, he has never worked in a laboratory. Instead, back in 1996, he released the first online shop software with SAP R/3 connectivity, just to learn, that the early bird does not necessarily catch the worm. After his move to Berlin, Germany, he founded first a marketplace for local service. In 2011 Entrepreneurs Club Berlin e.V. and Startup Camp Berlin followed–which is one of the largest German startup conferences today. His latest project „Age Of Product – Invent For Your Customers“ is now focusing on the exchange of knowledge between product people, designers and developers. It is about lessons learned and best practices on how to identify what product to build and how to build it in an efficient way. Age Of Product will host events and workshops in Berlin from autumn 2015 on and might also organize a new conference in the near future. The author can be found on Twitter under @StefanW and @AgeOfProduct. He can be reached via LinkedIn or email (stefan@age-of-product.com) and welcomes feedback, tips and shared experiences to improve the next version of this book.