I started out as a physicist, but moved to mathematics when I first ran into quantum mechanics. I retired from the military after 20 years. Jobs there included launch officer, trajectory engineer (rocket science), nuclear weapons effects, nuclear war planning (both theory and analytics), then on to teach operations research, game theory, artificial intelligence (algorithms), strategic and tactical sciences, and space operations at the Air Force Institute of Technology in Dayton OH. Retired, then went on to work at the Mayo Clinic in Rochester MN, first as a statistician, then as a big data miner using various mathematical tools. We were looking at physiology trying to predict anomalies in the in-patient setting. We succeeded, but implementation proved difficult.