Pronunciation: Simex is pronounced with a long i as in cipher. (S-eye-mex).

David Janzen is the owner and primary consultant/trainer at Simex LLC. David is also an Assistant Professor of Computer Science at California Polytechnic State University (Cal Poly) in San Luis Obispo, California where he teaches primarily in the software engineering program. David completed his PhD in computer science at the University of Kansas in August 2006. His research focuses primarily on empirical software engineering, most recently looking at the effects of test-driven development on software design quality. He holds a Master of Science in computer science from the University of Kansas, and a Bachelor's degree in computer science and mathematics from Tabor College. David has been developing software professionally for over thirteen years. He holds a patent from his work developing near real-time telecommunications fraud detection systems for Sprint. He is a Sun Certified Programmer for the Java 2 Platform, and he has developed software applications professionally in Java, C++, Lisp, VBA, and Fortran.

David formerly was an Associate Professor of Computer Science at Bethel College in North Newton, KS. Since January 2000, he has also been teaching industry training courses in Object-Oriented Analysis, Design, and Programming, focusing on UML, Java, and C++.

David regularly attends the OOPSLA conference and occasionally attends other conferences such as ICSE, CSEE&T, and the SIGCSE national conference. David has published extensively including a cover feature in IEEE Computer and research papers at conferences such as OOPSLA, CSEE&T, and SIGCSE.

David and his wife also created Morro Bay Dining, and ran The Campus Cottage, a guesthouse bed and breakfast in North Newton, KS.