He currently serves or has served as a Principal Investigator on fifteen federally funded research grants (apx. 50 million in funding) in the area of mathematics instruction focused on the development and efficacy testing of intervention programs spanning the K-6th grade spectrum in both traditional and technology based formats. Dr. Clarke has developed assessment materials in the area of early mathematics and number sense. He has published articles and book chapters in the area of mathematics instruction and assessment and developing multi-tiered instructional models in the area of mathematics including the IES practice guide “Assisting students struggling with mathematics: Response to Intervention (RtI) for elementary and middle schools”. Dr. Clarke was a practicing school psychologist for three years where he led district efforts to implement multiple tier instructional models.