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, LCSW, CASAC

Sr. Clinical Director of Drug Treatment

Wendy Jenerette

Sr. Director of Human Resources

Tawana Rowser-Brown, PhD, MSW, Master-CASAC, CRPA, CARC

Assistant Director -ECPPD

Donald Powell, MhS

Sr. Director of Programs and Development

Juan Jordan, CRPA

Director, Recovery Support Services

Shayra Vega, CASAC

Assistant Director, Judy Loeb Chiara Recovery Center

Dana Diamond, CASAC

Director of Health Services

Yvonne Soto, MBA, CASAC

Director of Transitional, GED, & Vocational Services

Frank Perez

Director of Data Systems

Victor Velazquez, CASAC

Director of Training

Viola Varner, LMSW, CASAC

Assistant Director of Drug Treatment

David Wilson

IT Manager

Alexandra Spinks

Individual Giving & Fundraising Manager

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