Vassilis DIGALAKIS

Assistant Professor

Information Systems and Operations Management

digalakis@hec.fr https://vvdigalakis.github.io/

Biography

Vassilis Digalakis Jr is an Assistant Professor of Operations Management at the Information Systems and Operations Management Department at HEC Paris, affiliated with Hi! Paris and GREGHEC. He completed his Ph.D. in Operations Research at MIT in 2023, advised by Prof. Dimitris Bertsimas. His research develops analytics and interpretable machine learning methodologies to facilitate the adoption of data-driven decision support tools in high-stakes applications, primarily in sustainability and healthcare. Vassilis has collaborated, among others, with OCP, the world's largest producer of phosphate and phosphate-based products, to develop an optimization framework that guides their 2 billion USD investment in solar panels and batteries; and with the Federal Emergency Management Agency to help them decide on locations for COVID-19 mass vaccination centers and state-level allocation policy.

To find out more, visit Vassilis' personal website https://vvdigalakis.github.io/.

Filter

Scientific articles

Slowly Varying Regression under Sparsity

Operations Research, Forthcoming, (in coll. with D. BERTSIMAS, M. L. LI, O. S. LAMI)

Decarbonizing OCP

Manufacturing & Service Operations Management, Forthcoming, (in coll. with D. Bertsimas, R. Cory-Wright)

Frequency Estimation in Data Streams: Learning the Optimal Hashing Scheme

IEEE Transactions on Knowledge and Data Engineering, 19 2023, vol. 35, n° 2, pp 1541-1553, (in coll. with D. Bertsimas)

Where to locate COVID-19 mass vaccination facilities?

Naval Research Logistics, Mars 2022, vol. 69, n° 2, pp 179-200, (in coll. with D. Bertsimas, A. Jacquillat, M. L. Li, A. Previero)

The backbone method for ultra-high dimensional sparse machine learning

Machine Learning, June 2022, vol. 111, pp 2161-2212, (in coll. with D. Bertsimas)

From predictions to prescriptions: A data-driven response to COVID-19

Health Care Management Science, June 2021, vol. 24, pp 253-272, (in coll. with D. Bertsimas, L. Boussioux, R. Cory-Wright, A. Delarue, A. Jacquillat, D. L. Kitane, G. Lukin, M. Li, L. Mingardi, O. Nohadani, A. Orfanoudaki, T. Papalexopoulos, I. Paskov, J. Pauphilet, O. S. Lami, B. Stellato, H. T. Bouardi, K. V. Carballo, H. Wiberg,)

Working papers

Improving Stability in Decision Tree Models

Cahier de Recherche , 2023

Decarbonizing OCP

Cahier de Recherche , 2022

Improved Pan-Private Stream Density Estimation

Cahier de Recherche , 2021

Slowly Varying Regression under Sparsity

Cahier de Recherche , 2021

Scientific articles

Frequency Estimation in Data Streams: Learning the Optimal Hashing Scheme

IEEE Transactions on Knowledge and Data Engineering, 19 2023, vol. 35, n° 2, pp 1541-1553, (in coll. with D. Bertsimas)

The backbone method for ultra-high dimensional sparse machine learning

Machine Learning, June 2022, vol. 111, pp 2161-2212, (in coll. with D. Bertsimas)

Where to locate COVID-19 mass vaccination facilities?

Naval Research Logistics, Mars 2022, vol. 69, n° 2, pp 179-200, (in coll. with D. Bertsimas, A. Jacquillat, M. L. Li, A. Previero)

From predictions to prescriptions: A data-driven response to COVID-19

Working papers

Improving Stability in Decision Tree Models

Cahier de Recherche , 2023

Decarbonizing OCP

Cahier de Recherche , 2022

Improved Pan-Private Stream Density Estimation

Cahier de Recherche , 2021

Slowly Varying Regression under Sparsity

Cahier de Recherche , 2021

Education

2023
Ph.D. in Operations Research, MIT, Massachusetts Institute of Technology - USA

Academic appointments

Academic Responsibilities at HEC

2023- Assistant Professor, Information Systems and Operations Management HEC Paris
2023- Member of GREGHEC, the joint research laboratory CNRS-HEC Paris, GREGHEC HEC Paris

Scientific Activities

Editorial activities

Reviewer for Operations Research, Manufacturing Service Operations Management, Journal of Machine Learning Research, INFORMS Journal on Computing, INFORMS Journal on Optimization

Conference organisation

2021- INFORMS Annual Meeting Session Chair

Awards & honors

2023 MIT ORC Best Student Paper Competition | Honorable Mention for Decarbonizing OCP" with Dimitris Bertsimas Ryan Cory-Wright
2023 MSOM Practice-Based Research Competition | Finalist for Decarbonizing OCP" with Dimitris Bertsimas Ryan Cory-Wright by INFORMS