Authors & Presenters

Kristyn Klei Borrero, EdD, is an accomplished educational leader and coach who strives to make a profound difference in the professional lives of educators. She is the cofounder of No-Nonsense Nurturer® and has served as a classroom teacher, principal, and superintendent.

MaryAnn Brittingham helps educators working with students at risk. She is an instructor and supervisor of student teachers at the State University of New York at New Paltz.

Lee Canter is a world-renowned expert on classroom management. His acclaimed Assertive Discipline® program has been the gold standard in the field since it was first introduced in 1976.

Tom Castellano has 50 years of experience in education. He shares his knowledge with educators as a consultant who offers presentations and workshops on Lee Canter’s relationship-based classroom management.

Alan J. Cohen is a tenured teacher in the New York City Department of education. He has taught children from many different socioeconomic backgrounds and with a wide range of behavioral needs.

Charlie Coleman has been a principal at all school levels (traditional K-12, plus alternate, virtual/online and blended learning) in ethnically and socioeconomically diverse communities. He is currently District Principal of Indigenous Education.

Jessica Djabrayan Hannigan, EdD, works with US schools and districts to design and implement effective social-emotional and behavioral systems. Her expertise includes RTI, PLCs, MTSS, PBIS, restorative practices, social-emotional learning, and more.

John Hannigan, EdD, is an author and speaker who has served in education for over 20 years as a teacher, instructional coach, principal, and county office leadership coach. His expertise includes RTI at Work™, PLC at Work®, MTSS, PBIS, restorative practices, social-emotional learning, and more.

Tammy Heflebower, EdD, is a highly sought-after school leader and educational speaker with vast experience in urban, rural, and suburban districts throughout the United States, Canada, the Netherlands, Denmark, and Australia.

Tom Hierck has been an educator since 1983 in a career that has spanned all grade levels. He has been a teacher, an administrator, a district leader, a department of education project leader, and an executive director.