Employers can provide motivation to succeed and then reward that success. Also important is perseverance. With all the distractions of life, it takes a lot of perseverance to stick with a class for a semester. Greivenkamp earned his Ph.D. from the UA Optical Sciences Center in 1980. Years later, when he became aware of the opportunity to teach at the University of Arizona, the decision was an easy one to make.
Teaching is wonderful.