Jerome F. Hajjar is the CDM Smith Professor and University Distinguished Professor in the Department of Civil and Environmental Engineering at Northeastern University, where he served as the Department Chair from 2010–2025. He is also the Director of the Laboratory for Structural Testing of Resilient and Sustainable Systems (STReSS Laboratory). His research and teaching interests include analysis, experimental testing, and design of steel and composite steel/concrete building and bridge structures, regional modeling and assessment of infrastructure systems, and earthquake engineering, and he has published over 300 papers and authored or edited five books on these topics.

Hajjar has served on numerous committees of the American Institute of Steel Construction (AISC), the American Society of Civil Engineers (ASCE), the ASCE Structural Engineering Institute (SEI), the Building Seismic Safety Council (BSSC), the Structural Stability Research Council (SSRC), and other organizations. He serves on the AISC Committee on Specifications and several of its task committees, including chairing Task Committee 5 on Composite Design, and he led the editing of the AISC Commentary for the 2005 AISC Specification. He is the past chair of AISC Task Committee 3 on Loads Analysis and Systems, and he chairs the AISC Sustainability Committee. Hajjar was a member of the SEI Board of Governors, where he served as President from 2023–2024. He is the past chair of the ASCE Department Heads Coordinating Council, and he was the 2004–2005 ASCE Minnesota Section President.

Hajjar was elected as a member of the National Academy of Engineering in 2022, was made a Fellow of ASCE in 2007 and of SEI in 2013, was made a Distinguished Member of the Structural Stability Research Council (SSRC) in 2025, and has been awarded numerous honors, including receiving the 2025 ASCE William H. Wisely American Civil Engineer Award, the 2024 SSRC Lynn S. Beedle Award for Lifetime Achievement, the 2021 AISC Lifetime Achievement Award, the 2010 Popular Mechanics Breakthrough Award, the 2009 ASCE Shortridge Hardesty Award, the 2005 AISC T. R. Higgins Lectureship Award, and the 2000 ASCE Norman Medal for his research on steel and composite structures, structural stability, and earthquake engineering. Hajjar is a registered professional engineer in Illinois and Minnesota.