Gabriel W. Hassler

Gabriel W. Hassler

Associate Statistician, RAND; Professor of Policy Analysis, RAND School of Public Policy

Gabriel Hassler is an associate statistician at RAND and a professor of policy analysis at the RAND School of Public Policy. He is broadly interested in computational Bayesian statistics and developing flexible yet highly structured statistical models that are scalable to big data. His subject-area experience includes childhood mental health, suicide, emergency risk communication, and well-being in the armed forces. He has particular expertise in studying infectious disease dynamics using phylogenetic and phylodynamic modeling. He has applied his methodological work to the study of relationships between viral genetics and clinical outcomes in HIV/AIDS, the evolutionary dynamics of the SARS-CoV-2/COVID-19 epidemic in North America, and the evolution of numerous other biological organisms over time. Hassler received his B.A. in anthropology and biology at Washington University in St. Louis and his Ph.D. in biomathematics at UCLA.

Education

B.A. in anthropology, Washington University in St. Louis; Ph.D. in biomathematics, University of California-Los Angeles (UCLA)

Selected Work

  • Gabriel W Hassler, Max R. Tolkoff, William L. Allen, Lam Si Tung Ho, Philippe Lemey & Marc A. Suchard, "Inferring Phenotypic Trait Evolution on Large Trees With Many Incomplete Measurements," Journal of the American Statistical Association, 2022
  • Gabriel W. Hassler, Brigida Gallone, Leandro Aristide, William L. Allen, Max R. Tolkoff, Andrew J. Holbrook, Guy Baele, Philippe Lemey, Marc A. Suchard, "Principled, practical, flexible, fast: A new approach to phylogenetic factor analysis," Methods in Ecology and Evolution, 2022
  • Anderson F. Brito, Elizaveta Semenova, Gytis Dudas, Gabriel W. Hassler, et al., "Global disparities in SARS-CoV-2 genomic surveillance.," Nature Communications, 2022
  • Nathaniel L Matteson, Gabriel W Hassler, Ezra Kurzban, Madison A Schwab, Sarah A Perkins, Karthik Gangavarapu, Joshua I Levy, Edyth Parker, David Pride, Abbas Hakim, Peter De Hoff, Willi Cheung, Anelizze Castro-Martinez, Andrea Rivera, Anthony Veder, Aria, "Genomic surveillance reveals dynamic shifts in the connectivity of COVID-19 epidemics," Cell, 186(26), 2023
  • Guy Baele, Xiang Ji, Gabriel W Hassler, John T McCrone, Yucai Shao, Zhenyu Zhang, Andrew J Holbrook, Philippe Lemey, Alexei J Drummond, Andrew Rambaut, Marc A Suchard, "BEAST X for Bayesian phylogenetic, phylogeographic and phylodynamic inference," Nature Methods, 2025
  • Gabriel W Hassler, Lynsay Ayer, Arielle H Sheftall, Beth Ann Griffin, Elie Ohana, "Age-Based Trends in Suicidal Ideation Among Child Welfare System-Involved Youth," Child Malteatment, 2025
  • Beth Ann Griffin, Gabriel W Hassler, Arielle H Sheftall, Elie Ohana, Lynsay Ayer, "Rethinking suicide prevention research—Moving beyond traditional statistical significance.," Crisis: The Journal of Crisis Intervention and Suicide Prevention, 2025

Authored by Gabriel W. Hassler

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