Mary Jean O’Reilly, Ph.D. is a school psychologist in Massachusetts and an adjunct professor in the School of Education at the University of Massachusetts at Amherst, where she has taught graduate courses on applied psychology in the classroom and participates in field-based supervision of graduate students in school psychology. She also teaches online graduate-level courses on school-wide behavior support for the Massachusetts Department of Education. Before becoming a school psychologist she was a public school teacher in Maryland, and is also certified to teach in Massachusetts. Dr. O’Reilly co-authored a chapter in Best Practices in School Psychology IV on classroom interventions for children with ADHD, which she and her coauthors have updated for the upcoming edition. She also co-authored a chapter on effective school practices in a recent book entitled Assessment for Intervention: A Problem-Solving Approach. Dr. O’Reilly graduated summa cum laude from the University of Maryland with a B.A. in Spanish language and linguistics and earned a Ph.D. in School Psychology from the University of Massachusetts at Amherst.