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U.S. Department of Health and Human Services

ASPR Leadership Biographies


Dawn O'Connell

Assistant Secretary for Preparedness and Response

U.S. Department of Health and Human Services

Ms. Dawn O’Connell serves as the Assistant Secretary for Preparedness and Response (ASPR) within the U.S. Department of Health and Human Services (HHS). The ASPR is the Secretary’s principal advisor on public health emergencies, and her office leads the nation in preventing, responding to, and recovering from the adverse health effects of man-made and naturally occurring disasters. The office coordinates interagency activities between HHS, other federal agencies, and state and local officials responsible for emergency preparedness and the protection of the civilian population from public health emergencies. Learn More >>​





David Christian Hassell, PhD

Acting Principal Deputy Assistant Secretary
Senior Science Advisor



Nikki Bratcher-Bowman

Deputy Assistant Secretary, Executive Management
US Department of Health and Human Services



Gary L. Disbrow, PhD

Director, Biomedical Advanced Research
and Development Authority
Deputy Assistant Secretary for
Preparedness and Response

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Jonathan Greene

Director, Office of Operations and Resources
Deputy Assistant Secretary for
Preparedness and Response



Patrick Hernandez

Director, Office of Incident Command and Control
Deputy Assistant Secretary for
Preparedness and Response

Kacey Wulff

Chief of Staff




  • This page last reviewed: July 09, 2021