Addison Consulting Dr. Roger M. Addison, CPT, is an internationally respected practitioner of Performance Improvement Consulting and principal of Addison Consulting. As the Senior... Dr. Roger M. Addison, CPT, is an internationally respected practitioner of Performance Improvement Consulting and principal of Addison Consulting. As the Senior Director of Human Performance Improvement for the International Society for Performance Improvement (ISPI) he was responsible for...