Our Team

Leadership & Dedicated Staff

The People Behind Exponents

Dedicated advocates, clinicians, and community leaders driving strength-based recovery, health equity, and hope across New York City for individuals impacted by HIV/AIDS, substance use, and incarceration.

Executive Leadership

Guiding Our Strength-Based Mission

Our executive team brings decades of lived experience, clinical expertise, and passionate advocacy to public health across NYC.

Chief Executive Officer

Chief Financial Officer

Samantha Lopez, MSW

Regina Edwards, LCSW

Samantha Lopez brings over 20 years of dedicated service to Exponents, having held numerous leadership roles within the organization. Most recently, she served as EVP & Chief Operating Officer, overseeing all agency programming, development, contracts, and facilities.

Prior to joining Exponents, Ms. Lopez worked at HIV Care Services, a program of Public Health Solutions, where she managed a portfolio of over 30 Ryan White Title 1 contracts. She began her career in the non-profit sector as Assistant Director of Program Development at Elmhurst Hospital.

A graduate of New York University, Ms. Lopez has also lent her expertise to the community as a member of the Community Advisory Boards for two Public Health Solutions (formerly MHRA) projects, FITA and HIV Care Services.

Regina Edwards is the Chief Financial Officer of Exponents, Inc. She has been with the organization for 23 years and oversees Finance, Human Resources, IT and Fundraising. Ms. Edwards directs the development and execution of major financial policies, plans, procedures, and controls and engages in financial analysis of all Exponents’ programs.

She is responsible for formalizing the organization’s accounting practices and procedures and ensures that a fundraising plan is executed to support its sustainability.

Ms. Edwards received her Bachelors’s in Accounting from Lehman College in the Bronx and came to Exponents with many years of not for profit experience under her hat. She served 6 years as Board Treasurer for the HIV Law Project, a non-profit organization dedicated to providing legal representation and advocacy for low-income people with HIV/AIDS. Ms. Edwards has happily made the non-profit sector a career choice and her life’s work.

Client-Centered Vision

Every individual carries intrinsic worth and potential. Our staff meets people exactly where they are to build paths toward lasting recovery and dignity.

Exponents Leadership Collective

Program & Community Leads

Frontline Champions of Care

Our dedicated program supervisors ensure compassionate service delivery, peer navigation, and community empowerment every day.

Peer Services Lead

HIV/AIDS Outreach Director

Re-entry Program Manager

Antar Bush

Tawana Brown

Donald Powell

Antar guides peer support specialists, leveraging personal recovery milestones to inspire participants and navigate healthcare systems efficiently.

Tawana coordinates community testing, educational workshops, and holistic wellness programs prioritizing dignity and harm reduction.

Donald supports individuals transitioning from incarceration into stable housing, workforce training, and supportive recovery networks.

Contact Our Team

Make a Lasting Difference in NYC

We are always seeking passionate clinicians, peer advocates, and organizers committed to health justice and human potential.

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