In addition to teaching at the college level, he has taught at the secondary level in Austria, Mexico, and Venezuela. Dr. Parker was a senior researcher at Johns Hopkins University where he researched the personality and adjustment of gifted individuals as well as evaluating educational programs. He has been awarded the Mensa International Award for Excellence in research three times. Since 2000 he has been the director of Research and Evaluation for the Piper Trust, where he is responsible for evaluating the effectiveness of programs funded by the Trust.