Trainer at FIRST
My contributions to other Open Source Projects can be found on
I have created several iOS apps that have been published in the AppStore beginning with iOS 2.0 (where Apple introduced the AppStore). Some applications have been created for customers some for my Startup [see iOS-projects (German)]
Since 2001 I was involved in several web based projects / applications for customers or startup or simply as a hobby. Most of the projects are listed: Web-Projects (German).
To avoid mixing up things I set up another blog to cover security topics called sec.sexy.