School Leadership

Leonore Johnston, Executive Director

Ms. Leonore Johnston has devoted a thirty-five year career to special education in various roles as an educational leader, trainer and educational innovator. Before joining Cornerstone Day School, Ms. Johnston spent many years as the Director of Special Services in the Hillsborough School district in Somerset County, New Jersey, and brings first-hand knowledge of the needs of professionals, students and families.

Ms. Johnston is a graduate of Kean College where she received a Bachelor of Arts and Master of Arts degrees in Speech/Language Pathology. Early in her career, Ms. Johnston was a special education teacher as well as a learning consultant. Her many certifications include Speech/Language Specialist, Teacher of the Handicapped, Learning Disability-Teacher Consultant, Supervisor, Principal and Chief School Administrator.

In addition, Ms. Johnston was an adjunct instructor on both the undergraduate and graduate level for fourteen years at The College of New Jersey, for Language-Literacy and the Special Education Department. She also instructs for NJ EXCEL, a program for individuals seeking certification in educational leadership, as a supervisor or principal.

Ms. Johnston has also taught internationally, teaching graduate level coursework in Lisbon, Portugal at the Frank Carlucci American International School for The College of New Jersey.


Gregg Weisman, Principal

Gregg Weisman has been Principal at Cornerstone Day School for the past ten years. Mr. Weisman has worked with adolescents in need of both emotional and behavioral support as a teacher and an administrator in both the public and private sectors. Just prior to joining CDS, Mr. Weisman was the principal of an alternative high school program for at-risk youth in a large public school district. Mr. Weisman holds two masters degrees from NJCU; one in Special Education and the other in Educational Leadership.


Bindu Khanna, Medical Director

Dr. Khanna is a Board Certified Child and Adolescent Psychiatrist who has been in practice for eighteen years. She graduated with a MBBS (Bachelor of Medicine and Bachelor of Surgery) from the University of Mumbai, completing her residency in psychiatry at SUNY Brooklyn, New York. Dr. Khanna also completed a Fellowship in Child and Adolescent Psychiatry at UMDNJ. Over her career, Dr. Khanna has worked at Delaware Guidance Services, Hackensack University Medical Center and the Institute for Child Development. Along with Cornerstone Day School, Dr. Khanna is on staff at St Joseph’s Regional Medical Center and is in private practice at the North Jersey Center for Psychiatric Services.

Dr. Khanna is also a volunteer, presenting parent education workshops and training seminars on mental health issues and she serves on the Professional Advisory Committee for SAMHAJ- NAMI. She was recognized for her work by NAMI in 2014 and awarded the Exemplary Psychiatrist Award. Dr. Khanna maintains a strong belief in patient and family education and its role in successful adolescent treatment. To the great satisfaction of many Cornerstone parents, this emphasis is a strong component of her work at the school.


Jennifer Hayes, Clinical Director

Jennifer Hayes is the Director of Clinical Services at Cornerstone Day School. She has experience working in multiple settings on the mental health continuum, including outpatient, partial, psychiatric emergency and residential. Prior to joining CDS, she was the Director of Outpatient Mental Health Services at a large hospital in an urban setting. Jennifer received her Master’s degree from NYU and has received post-graduate training in family systems and TF-CBT.