Our Team

Executive Team

Joseph R. Turner, JD, is the co-founder and current President/CEO of EXPONENTS, Inc., in New York City. EXPONENTS is the first known harm reduction substance…
Executive Vice President/CFO
Regina Edwards is the Executive Vice President & Chief Financial Officer of Exponents, Inc. She has been with the organization for 23 years and oversees…
Executive Vice President/COO
Samantha Lopez has been with EXPONENTS for over fifteen years first as Director of Development & Contracts then Director of Quality Assurance and Chief Administrative…


As a collective, we make sure to work as hard as possible to produce high-quality results in a loving and supportive environment. We believe that a team is only as strong as its weakest link, and we are proud to say that everyone we work with is leaders in their own right.


Melissa Rios-Malave

Sr. Clinical Director of Drug Treatment

Wendy Jenerette

Sr. Director of Human Resources

Dr. Tawana Rowser-Brown

Assistant Director -ECPPD

Donald Powell

Sr. Director of Programs and Development

Juan Jordan

Director, Recovery Support Services

Dana Diamond

Director of Health Services

Yvonne Soto

Director of Transitional & Vocational Services

Frank Perez

Director of Data Systems

Victor Velazquez

Director of Training

Viola Varner

Assistant Director of Drug Treatment

David Wilson

IT Manager

Alexandra Spinks

Individual Giving & Fundraising Manager

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