Our Team


Members of the Board

Oversee strategy, budget and operations of the Long Island Explorium, including oversight of management, compensation, and development

Demonstrate support for the Vision of the Explorium by promoting its good work, generating goodwill for the organization, encouraging support for its efforts

Assist in identifying and cultivating potential donors and stakeholders to ensure the financial sustainability of the Long Island Explorium.

Executive Committee

Kathleen de Riesthal, President

Professor of Latin, Stony Brook University.

Kathleen de Riesthal is a Lecturer at Stony Brook University in the Department of European Languages, Literatures and Cultures and a former high school Latin teacher.  Kathleen sits on the Board of Directors for Stony Brook Childcare and on the Advisory Council of the Staller Center. She has three young sons who love scientific exploration.

headshot photo of Antonetta Mattern.
Antonetta Mattern, Treasurer, Finance Committee Chair

Senior Financial Analyst
CPA, Stony Brook University

Toni Mattern is a Senior Financial Analyst with advanced Excel, PeopleSoft, report writing, presentation, and communication skills. Over twenty years of experience in closing books and preparing Audits at Luitpold Pharmaceuticals, Faculty Student Association, Stony Brook Child Care and Stony Brook Athletics Department here on Long Island.

Greg Dinin, Secretary, Education Committee Member

Member; Senior Technical Account Manager, Microsoft.

Greg has nearly three decades of experience in the IT Industry and has traveled the planet architecting, building and supporting IT infrastructures for some of the largest IT and Telecom companies in the world such as Microsoft, CA Technologies, British Telecom, Japan Telecom, Korean Telecom, VSNL, Verizon and Cable and Wireless to name a few. Greg has held numerous Senior and Leadership roles in Support, Software Development and Testing, Professional Services and most recently, as a Microsoft Technical Account Manager where he pursues his passion working with Higher Ed and K-12 Educators and Leadership in empowering students, teachers, educators and their organizations to achieve more leveraging Microsoft Products, Services and Solutions in the NYC Metro Area. Greg is a life-long learner and Maker, always looking for opportunities to share what he knows to make an impact in inspiring the next generation to dream big and create with STEM as their guide.


Anurag Purwar, Ph.D – Member, Education Committee Chair

Professor of Engineering, Stony Brook University.

Bio to be added

Chelsea Finn, MSN, RN, CPNP-PC, CPEN, CEN, CNL – Member

Clinical Instructor, Pediatric Emergency Department Stony Brook Children’s Services.
Pediatric Nurse Practitioner, SV Pediatrics.
Adjunct Faculty, School of Nursing, Stony Brook University

Chelsea is a Pediatric Nurse Practitioner who works at Stony Brook Hospital. She is on the Board of the local Long Island chapter of the National Association of Pediatric Nurse Practitioners. She has a passion for science, environmental conservation, and education. She enjoys bringing her two young children to the Explorium


angeline square headshot
Angeline Judex, MPA, Executive Director

Angeline serves as the Executive Director of the Long Island Explorium. She is a veteran nonprofit executive with academic and professional experience through North America, Europe and Asia. Her passion is in advancing the learning of science and engineering concepts that can translate into skills that address social, economic and environmental issues. Angeline brings to the Explorium an in-depth understanding of the diversity in educational systems and academic standards. She currently serves in the Brookhaven ( NY) NAACP branch as Chair of the ACT-SO committee.

Lisa Collet Rodriguez, M.S., Deputy Director, Programs, Marketing and Technology

Technology and Education Consultant

Former Assistant Director, Upward Bound Math Science, Hofstra University

Lisa serves as the Digital Marketing and Media hub of the Long Island Explorium. A veteran Technology and Education Consultant with a background in Counseling and extensive background and experience in education, nonprofit, and corporate. Her passion is the convergence of those realms in S.T.E.A.M. learning and exploration.

Maria Obiols, Manager, Memberships and Community Relations
Kevin Sweeney, Museum Manager


Susan Campbell, James Myers, Sr. Educator

Susan has retired from spending 27 wonderful years teaching biology at Brentwood High School. Before her education career, Susan spent several years working as a Medical Technologist and as a lab technician at Cold Spring Harbor Laboratory. She is hoping to help spark a lifelong love of asking questions and finding solutions in learners with a wide variety of backgrounds and experiences.

Erika Heilmann, Sr. Educator
Jake Murphy, Sr. Educator

Jake Murphy describes himself as an ecologist, educator, and explorer. He has a bachelor's in ecological science with a concentration in Marine Science and a focus on drone technology for efforts in conservation technology.

James Myers, Sr. Educator
Gianna Alcala, Museum Educator
Rianna Balz, Museum Educator, Volunteer Coordinator, National Math Club Leader
Victoria Heffern, Museum Educator
Victoria Mena, Museum Educator
Kallen Fenster, Video Production Associate (Intern)

Kallen Ellis Fenster is a film and media producer and spends time between Dix Hills, NY and Dorset, Vermont where he attends Burr and Burton Academy as a High School Freshman (2020/2021).  When not screenwriting, shooting or editing film and video, he studies violin and performs in various classical and jazz music programs.  Kallen also has a deep interest in social issues including climate change and social equity. He has volunteered and interned with environmental organizations such as the North Shore Land Alliance and in 2019 was the lead youth organizer for the youth lead climate change rally in Suffolk County, NY.  In 2020 he was selected as an ADL Edward Brodsky Fellow. As a media maker himself, Kallen is honored to collaborate with the Long Island Explorium team that inspires other young makers of all kinds in the community.


The Long Island Explorium could not operate without the contributions of our volunteers who contribute their time, ideas, and energy. Their unique talents enable the Explorium to offer its current level of services to the community.

The program is flexible, matching available opportunities to your talent and availability.

All of us at the Long Island Explorium are committed to provide an enriched experience for children and their parents through a constructivist approach to learning.  We strive to provide an engaging experience that can only be achieved by the combined effort of a dedicated skilled team of employees and volunteers.

To apply to be a volunteer, please complete this online form. Our volunteer coordinator will contact you shortly.

Work for us

The Long Island Explorium supports diversity in the workplace. The Explorium is an equal opportunity employer (EOE) and supports a drug-free workplace. Available positions are updated on a regular basis.