About Jason
Jason Callahan is a Senior Health Scientist, Certified Industrial Hygienist (CIH) and Certified Safety Professional (CSP) with 15 years of professional experience helping clients assess environmental and occupational health risks, manage complex emergency responses and make informed decisions using defensible scientific data. His expertise spans industrial hygiene, environmental emergency response, exposure assessment and litigation support, with experience supporting more than 100 incidents and projects across multiple industries.
At Onterris, Mr. Callahan supports environmental emergency response, conducts industrial hygiene assessments and analyzes complex environmental and health data. He collaborates with federal, state and local agencies within the National Incident Management System (NIMS) to manage incidents of national and international significance. Combining field experience with technical capabilities in software development, relational databases, geographic information systems (GIS) and data visualization, he transforms large, complex datasets into clear, actionable insights for clients and response teams. His experience also includes data quality control, data collection management and evaluating chemical, biological and physical hazards across healthcare, transportation, petroleum and industrial facilities.
Mr. Callahan earned a Bachelor of Science (B.S.) in Environmental, Soil and Water Science from the University of Arkansas and a Master of Science (M.S.) in Environmental and Occupational Health from the University of Arkansas for Medical Sciences.
