School Leadership

Salvador Uy, Assistant Executive Director

Salvador Uy is a proud 1983 graduate of UNIS, and the child of UN parents. Before returning to UNIS as Assistant Executive Director in 2012, Sal ran operations and programs for two large New York social service organizations focusing on justice and community.

Although trained as an attorney, Sal has spent most of his career prior to UNIS in local government agencies and non-profit organizations. In the late 1990's he was an Assistant Commissioner at the New York Department of Homeless Services, where he managed shelters that housed 3,000 single men and women every night. In the non-profit arena, he also managed family shelter facilities for families fleeing domestic violence and in his last position, as Associate Director for Operations at the Goddard Riverside Community Center, managed housing for 600 single men and women, as well as the infrastructure and operations for the balance of a $35 million multiservice organization. Sal holds an A.B. from Princeton University and a J.D. from Columbia University School of Law.

Tutorial House Principal

Antoine Delaitre

Antoine Delaitre’s personal life, professional experience, and wide range of passions have imbued him with a strong international mindset. HIs lifelong curiosity leads him to travel often to the far reaches of our world. He has lived in Algeria, Greece, France, Gabon, the United States of America and speaks five languages.

Prior to joining UNIS in 2015, he held a variety of leadership positions during his 18 years at the French American International School in San Francisco including head of department, IB and travel program coordinator, high school assistant principal, and middle school principal.

As a high school principal, Antoine encourages his colleagues to take risks, apply best practices, and keep their love of teaching alive. As a teacher, Antoine believes in challenging preconceived ideas and in fostering a spirit of discovery and adventure in students. He strives to provide students with opportunities for cross cultural communications and life-changing experiences,

Antoine holds a Master’s Degree, a Master of Advanced Studies, and the Agrégation in history from the University of Paris.

Middle School Principal

Chad Fairey

Chad has nearly twenty years of experience as an educator and leader in American public schools, independent schools and international schools abroad. Prior to joining UNIS he served as the Head of School at Sotogrande International School in southwestern Spain; along the path of his educational journey he has served as a educational consultant, Deputy Head of School, Technology Director, Curriculum Coordinator and a middle/high school history teacher.

A native of Florida, he holds a Bachelor's degree in History from Florida State University, a Master's degree from the University of Virginia, and is currently completing a doctoral degree in educational leadership from the University of Bath in the United Kingdom.

Actively involved with leadership in the US as well as in international schools, he has served as a fellow with the Library of Congress, as a member of the Curriculum Committee of the National Council for the Social Studies (NCSS), as the chair of the IT Committee of the European Council of International Schools (ECIS), the chair of the Professional Learning & Action Research Committee for ECIS, and the founding chair of the International Schools SIG of the International Society for Technology in Education (ISTE). Since 2007 he has been an instructor and workshop facilitator at the Principal’s Training Center for International School Leadership.

Chad's background as an educational leader, trainer of teachers and consultant have all contributed to his passion for progressive learning design, educational methodology, organizational excellence and community-building.
Junior School Principal

Shireen Appana

Shireen Appana has a distinguished career as a teacher, subject coordinator, and PYP coordinator at schools in South Africa, New Zealand and Germany. Her most recent position was Primary School Principal at Bonn International School, Germany, an IB World School.

A citizen of South Africa, Shireen has a BA in History and Education from the University of South Africa, a post-graduate diploma in teaching English and Afrikaans from Springfield Teacher’s College, Durban, and a B. Ed and M. Ed in Teaching and Learning from the University of Natal, Durban. Her languages are Afrikaans, English, German and Dutch.

In addition to her strong educational background and academic credentials, Shireen is committed to providing a dynamic learning environment which includes the creative use of technology in teaching, and opportunities for learning beyond the classroom through student leadership and service activities.


Judith Honor

Dr. Judith Honor has been the principal of the Queens campus for the last thirteen years. Before coming to UNIS, Judith was principal of the elementary division campus at the Anglo American School, Moscow, and a school head in the North West of England.

Judith received both her Bachelor of Education and a master’s degree from University College, Chester, UK. A love for the creative arts led to a doctorate in curriculum and teaching from Boston University, MA with a dissertation focus on imagination in student learning.

In addition to her professional life, Judith spends time with her children and grandchildren.

Chief Financial

Stephen Roache

Stephen Roache has over thirty years of experience in finance. Before coming to UNIS in 2005, he was the Chief Financial Officer for Convent of the Sacred Heart School, the American Folk Art Museum, and the Harlem School of the Arts. Previously, he held senior financial positions at the Port Authority of New York and New Jersey, HBO, and CBS.

From 2003-2008 Stephen was Vice President, Treasurer of the Board of Directors, Today’s Students Tomorrow’s Teachers in Elmsford, NY. He has a B.A in Political Science from City College of New York and an MBA in Finance from New York University Stern School of Business.

Director of Admissions

John Nichols

John Nichols grew up in the United States and England, and received his A.B at Harvard, where he majored in English Literature. After law school at Boston University, he worked for a law firm in Washington, D.C., and then began teaching, first at Harvard, then at Eton College in England. For fourteen years, he was the Dean of Students at Trinity School in New York, and then worked for the president of New York University, with the goal of starting a tuition-free private school in New York. He was then Dean of Admissions and Academic Dean at the Baltimore School for the Arts, a pre-professional arts high school. He became Director of Admissions at UNIS in May 2012.

His favorite activities are traveling, going to the theater, and playing squash (even though his game hasn't improved at all in many years!).

Director of Student Support & Success

Dr. Topher Collier

Dr. Topher Collier has devoted nearly 20 years to the educational and mental health needs of children and families as a classroom teacher, curricular developer, teacher educator, and school psychologist, as well as through his private practice work in clinical and school psychology and neuropsychology. Through his experience as both an educator and a clinician, he has a passion for an interdisciplinary, strength-based approach to supporting children as individuals and as family and community members. In the schools he has served, Dr. Collier has developed a collaborative model to facilitate student success in which the educational, psychological, and physical needs of children are supported in consort, and in which the environment of the home and school culture are nourished.

Dr. Collier has a diverse background with roots in the arts, in education, and in psychology. He received his undergraduate degree in communications, theater and English, with secondary education certification. He earned his doctorate in professional child/school psychology from New York University, as well as a supplementary Master’s degree in child and school psychological services. He has received additional post-graduate training in mental health and school counseling with concentrations in gifted and talented youth, school neuropsychology, and trauma and grief. He holds Diplomat status with the American Board of School Neuropsychology.

Following the completion of his doctorate and post-doctoral training, Dr. Collier was a staff psychologist at New York-Presbyterian Hospital, where he coordinated an after-school group therapy program for school-age children; provided individual and family therapy; completed psychological and neuropsychological assessments of children and adults; conducted psycho-educational workshops on cognitive and emotional development and common parenting concerns and issues; and helped train psychology fellows, interns and externs.

Beyond his work in school settings and private practice, Dr. Collier is the founding editor of Trauma Psychology Newsletter for Division 56 (Trauma Psychology) of the American Psychological Association. He is a member of the Board of Directors of the New York Branch of the International Dyslexia Association. Dr. Collier is also actively involved with the World Wide Orphans Foundation, for whom he is coordinating international assessment, early intervention programs, and staff development and training for children living in orphanages. In addition, he is on the Advocacy Council of the Citizen’s Committee for Children of New York and volunteers as a psychological consultant for the National Tay-Sachs and Allied Diseases Association.

Dr. Collier began in the creative arts and has, over the course of his career, merged this interest with his commitment to support the learning and wellbeing of children and families. He has served as a consultant on a number of documentary film projects, including Travis (PBS); Just Another Kid and Turning Point: Reaching Out with a Helping Hand (Skyline Community) and others. Dr. Collier is also on the Advisory Board for Dyslexia-ville, an online community, web series, and national awareness campaign.


Susan Enzer

Susan Enzer is the Executive Assistant to the school’s Executive Director and a dedicated member of the UNIS family from the time her sons attended Junior and Middle school from 1985 until 1996. During those years, Susan served as Parents Association President as well as a parent-elected Trustee on the UNIS Board. She joined the Director’s office in 2010 having spent most of her career as a Marketing Communications Director in financial services.

Susan is an officer of a local political club for her assembly district, a member of the New York County Committee and a delegate to the Judicial Nominating Committee. Susan has spent time as a volunteer for Juvenile Diabetes Research Foundation in New York City and served on the board of Art OMI in Ghent, NY. She is founder of a book club that meets monthly since 2005 for discussion and dinner. Susan also enjoys theatre, ballet and the feast that is New York.

Susan holds a B.A. in Literature from Hofstra University and has done graduate studies in suburban planning and marketing. She is also a certified paralegal.

Dir. of Academic Technology

Pascal Vallet

Pascal comes to us from the Lycee Francais in Seoul, Korea, where he was both the Principal of a large Elementary Section and the Regional Director of Academic Technology and Teacher Training for the French Network of Schools in the Asia Pacific Region. Previously Pascal was Head of an International French school in Bali, Indonesia, a technology coordinator in the US, and a teacher in “at risk” schools in France. Pascal speaks French, English, Korean and has a strong international track record for innovation, team-building, and collaboration.

Director of Athletics and P.E.

Duncan Davison

Duncan has worked as a teacher, coach and educational leader for the past 25 years in a variety of educational and sporting organizations. In his current role as the Director of Athletics & Sport and Physical Education at the United Nations International school, he is responsible for the leadership of 36 sports teams and over 40 coaches across both the Manhattan and Queens campuses and for the leadership of the PK-12 P.E curriculum. Duncan earned his Masters degree from Sydney University and has worked in leadership roles with education, corporate and non-profit sectors in Australia and the US.

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