High Quality Content by WIKIPEDIA articles! Werner Heisenberg contributed to science at the point that the old quantum physics was discovering the field littered with more and more stumbling blocks. He decided that quantum physics had to be re-thought from the ground up. In so doing he excised several items that were grounded in classical physics and its modeling of the macro world. Heisenberg determined to base his quantum mechanics "exclusively upon relationships between quantities which in principle are observable." By so doing he constructed an entryway to matrix mechanics.