Completed and Ongoing Research

Optimal Ethical Decision-Making

• Differential privacy via distributionally robust optimization
  AS, Huikang Liu and Wolfram Wiesemann
  Operations Research (2025)
  [preprint]
  ☆ Second Place: 2024 George Nicholson Student Paper Competition
☆ Winner: 2023 ICBS Operations and Analytics Best PhD Paper Award
☆ Honorable Mention: 2023 INFORMS Optimization Society Student Paper Prize

• Room for improvement: Optimal and fair housing allocation via weakly coupled Markov decision processes
  AS, Bill Tang, Cagil Kocyigit, Phebe Vayanos, and Wolfram Wiesemann
  Working Paper (2024)
  

• Mixtures of Gaussians in approximate differential privacy
  Huikang Liu, AS, and Wolfram Wiesemann
  Under Review (2025)
  ☆ Appeared: 2025 INFORMS Workshop on Data Science
  

Robust Machine Learning

• It's all in the mix: Wasserstein classification and regression with mixed features
  Reza Belbasi, AS and Wolfram Wiesemann
  Minor Revision at Manufacturing & Service Operations Management (2023)
  [preprint]

• Distributionally and adversarially robust logistic regression via intersecting Wasserstein balls
  AS, Eleonora Kreacic, Mohsen Ghassemi, Vamsi Potluru, Tucker Balch and Manuela Veloso
  Uncertainty in Artificial Intelligence (UAI) (2025)
  [preprint]
  ☆ Oral Presentation
☆ Finalist: 2024 INFORMS Data Mining Society Best Student Paper Competition
☆ Appeared: 2024 INFORMS Workshop on Data Science
  

• Wasserstein logistic regression with mixed features
  AS, Reza Belbasi, Martin Haugh and Wolfram Wiesemann
  Neural Information Processing Systems (NeurIPS) (2022)
  [preprint] [conference page]

Nonconvex Optimization

• Maximizing the sum of maxima of convex functions
  AS, Aharon Ben-Tal, and Wolfram Wiesemann
  In preparation for submission (2024)

• Convex maximization via adjustable robust optimization
  AS, Aharon Ben-Tal, Ruud Brekelmans and Dick den Hertog
  INFORMS Journal on Computing (2022)
  [preprint] [INFORMS]
  ☆ Winner: 2021 INFORMS Computing Society Student Paper Award

• A reformulation-linearization technique for optimization over simplices
  AS, Dick den Hertog and Wolfram Wiesemann
  Mathematical Programming [Short Communication] (2023)
  [preprint] [Springer Link]

• Using column generation to solve extensions to the Markowitz model
  Lorenz M. Roebers, AS and Juan Vera
  The Engineering Economist [Technical Note] (2019)
  [preprint] [Tandfonline]

Doctoral Dissertation

• Models and algorithms for safeguarded data-driven decision making
  AS [Imperial Spiral]
  ☆ Finalist: 2025 George Dantzig Dissertation Award
☆ Winner: 2024 G-Research Imperial College PhD competition