Ontologist

Johns Hopkins Applied Physics Laboratory (APL) seeks an Ontologist to design, model, and maintain semantic knowledge representations supporting defense and aerospace missions within the Data Science & AI Department. You will develop and govern ontologies, taxonomies, and knowledge graphs that power advanced analytics, decision support, and AI/ML systems for national security and space applications. Collaborating with domain experts, you will translate complex operational concepts into machine-interpretable models, ensure semantic interoperability across systems, and contribute to standards, tooling, and best practices in knowledge engineering in a mission-driven, research-focused environment.