Dan Harrison, Ph.D. - Organizational Psychology. Dr Harrison is the developer and CEO of Harrison Assessments' and originator of ParadoxTechnology" as used in Harrison Assessments. His diverse background in Mathematics, Personality Theory, Counseling Psychology, and Organizational Psychology has enabled him to make a unique and exceptional contribution to assessment methodology. His 30 years of experience in Psychology and Assessment has enabled the Harrison Assessment tools to fulfill practical needs for recruitment, development and assessment.