Journal Papers 

H. El Hajj, D. R. Bish, and E. K. Bish. Improving cystic fibrosis screening through a novel testing design. Production and Operations Management, 1-25, 2025.
INFORMS Public Sector Operations Research Best Paper Award, Finalist (2024) 

H. El Hajj, F. Gzara, and S. Elhedhli. Efficient resource sharing for strategic disaster preparedness. European Journal of Operational Research, 1-12, 2025. 

H. El Hajj, F.Gzara, and S. Elhedhli. Analytical models and methods for the COVID-19 pandemic: A survey focused on progression and mitigation. Information Systems and Operational Research, 1-41, 2025. 

H. El Hajj, F. Gzara, and S. Elhedhli. A review of analytical models and methods for COVID-19: vaccination and testing. Information Systems and Operational Research, 1-40, 2025. 

M. Shams Eddin and H. El Hajj. An optimization-based framework to dynamically schedule hospital beds in a pandemic. Healthcare, 13(18): 2338, 2025.

M. Shams Eddin, H. El Hajj, R. Zayyat, and G. Lee. Systematic comparison of different compartmental models for predicting COVID-19 progression. Epidemiologia, 6(3): 33, 2025.

D. R. Bish, E. K. Bish, and H. El Hajj. Disease bundling or specimen bundling? Cost-and capacity-efficient strategies for multidisease testing with genetic assays. Manufacturing and Service Operations Management, 26(1): 95-116, 2024.
INFORMS Pierskalla Best Paper Award, Finalist (2024) 

H. El Hajj, D. R. Bish, E. K. Bish, and D. Kay. Novel pooling strategies for genetic testing, with application to newborn screening. Management Science, 68(11): 7994-8014, 2022.
INFORMS Pierskalla Best Paper Award, Runner-up (2021) 

H. El Hajj, D. R. Bish, and E. K. Bish. Optimal genetic screening for cystic fibrosis. Operations Research, 70(1): 265-287, 2022.
INFORMS Health Applications Society Student Paper Competition, Runner-up (2019) 

H. El Hajj, D. R. Bish, E. K. Bish, and H. Aprahamian. Screening multi-dimensional heterogeneous populations for infectious diseases under scarce testing resources, with application to COVID-19. Naval Research Logistics, 69(1): 3–20, 2022. 

H. El Hajj, D. R. Bish, and E. K. Bish. Equity in genetic newborn screening. Naval Research Logistics, 68(1): 44–64, 2021. 

D. R. Bish, E. K. Bish, H. El Hajj, and H. Aprahamian. An approach to pooled testing to expand COVID-19 screening capacity. PLOS One, 16(2): e0246285, 2021.