Dr. Tierney is a Washington-based pediatrician who is a member of the Institute for Public Health Innovation and the D.C. Primary Care Association Medicaid Financing Task Force on Medicaid payment for community health workers. She also works with Howard University Hospital’s Cancer Center on tobacco use avoidance and/or cessation by African American youth. She is on the board of Whitman-Walker Health to advise on Medicaid payment and sits on the quality assurance committee.