Dr. Gilliam’s research involves early childhood education and intervention policy analysis (specifically how policies translate into effective services), ways to improve the quality of prekindergarten and child care services, and the impact of early childhood education programs on children’s school readiness. His scholarly writing addresses early childhood care and education programs, school readiness, and developmental assessment of young children. Dr. Gilliam has led national analyses of state-funded prekindergarten policies and mandates, how prekindergarten programs are being implemented across the range of policy contexts, and the effectiveness of these programs at improving school readiness and educational achievement, as well as experimental and quasi-experimental studies on methods to improve early education quality. Dr. Gilliam actively provides consultation to state and federal decision-makers. His work has been covered in major national and international news outlets for print, radio, and television.