My research focuses on helping businesses understand the consequences of uncertainty and risk as well as helping predict the efficacy of potential mitigation techniques. To that end, I create both stylized and practical mathematical models and develop novel solution methodologies and analyses. My research uses non-linear programming, linear programming, integer programming (including branch-and-price) and statistical modeling. I create useful models to make both strategic and on-line decisions, as well as behavioral models and experiments to investigate the potential effect of decision makers on the ability of firms to make optimal choices.
Publications
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T. B. Cassidey, N. K. Freeman, S. H. Melouk, and A. Narayanan.
Concurrent sourcing behavior and bounded rationality under capacity
constraints.
European Journal of Operational Research,
331(1):229–241, 2026.
[doi]
Develops a probabilistic characterization of capacitated and multi-variate sourcing decisions, using a discrete choice model. Motivates and examines a laboratory experiment to measure human subject performance against theoretical performance in a concurrent sourcing task.
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T. B. Cassidey and I. Dayarian.
The k-traveling repairman problem with stochastic service request
times.
Transportation Science, 60(1):22–45,
2026.
[doi]
Presents a novel branch-and-price algorithm to incorporate randomly occurring service request times of customers in a multiple service agent routing problem.
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T. B. Cassidey, N. Freeman, and S. Melouk.
Leveraging concurrent sourcing for risk mitigation and pricing.
Omega, 113:102723, 2022.
[doi]
[publisher]
Formulates and analyzes a non-linear model for concurrent sourcing decisions under all-or-nothing supplier disruptions. Investigates the effect of concurrent sourcing ability on the supplier’s optimal pricing strategy.
Submitted Manuscripts
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T. B. Cassidey, E. Griffin, B. Keskin, and O. Satici.
The integrated sourcing and virtual node location problem.
Develops and solves the inventory availability and customer expectation problem for a retailer subject to carrier network uncertainty.
Working Papers
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T. B. Cassidey, N. Freeman, and S. Melouk.
Concurrent sourcing under stochastic lead time risk.
Analyzes the optimal concurrent sourcing and expediting strategy under supply disruptions manifested as delayed lead times.
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T. B. Cassidey, E. Griffin, and B. Keskin.
On-line supplier selection of a drop-shipping retailer.
Develops online algorithms for supplier selection of an e-retailer to maximize a multi-criteria objective.
Elsewhere
Conference presentations, teaching and service are listed in my CV. This work also appears on Google Scholar and ORCID.