Dr. Ralph D. Semmel is the eighth director of the Johns Hopkins Applied Physics Laboratory (APL). As director, Dr. Semmel leads the nation’s largest university affiliated research center, which performs research and development on behalf of the Department of Defense, the Intelligence Community, NASA, and other federal agencies. The Laboratory has more than 8,000 staff members who are making critical contributions to a wide variety of nationally and globally significant technical and scientific challenges.
Chief of Staff
Assistant Director, Science and Technology; Chief Technology Officer
Head, Force Projection
Head, Talent Services; Chief Diversity and Inclusion Officer
Head, Business, Construction, and Facilities; Chief Financial Officer
Head, Information Technology Services; Chief Information Officer
General Counsel
Head, Research and Exploratory Development
Assistant Director, Programs; Chief Strategy Officer
Assistant Director, Policy and Analysis
Head, Space Exploration
Head, Asymmetric Operations
Head, Communications; Chief Communications Officer
Head, Security Services; Chief Security Officer
Head, National Security Analysis
Head, Air and Missile Defense