Executive Leadership
Chief Executive Officer
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 Financial Officer
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…
Senior Management
Sr. Director, Community Programs & External Relations
Donald R. Powell is a nonprofit professional and community advocate with more than three decades of experience in nonprofit development, public health, social services, and…
Sr. Director, Clinical Programs & Evaluation
Antar Bush is a licensed social worker, public health professional, and nonprofit leader with extensive experience in behavioral health, HIV prevention, clinical services, health education,…
Sr. Director, Workforce Development & Recovery Services
Dr. Tawana Rowser-Brown is a dedicated behavioral health and recovery services professional with extensive experience in workforce development, addiction services, peer recovery support, and professional…