Harry Richman

Mathematician, Computational Biologist

hrichman@alum.mit.edu | academic web page

Research interests

Tropical geometry, phylogenetic inference, curvature on graphs

Occupation

2024 - current National Center for Theoretical Sciences, Taipei

2023 - 2024 Fred Hutch Cancer Center, Seattle

2020 - 2022 University of Washington, Seattle

Education

2014 - 2020 University of Michigan, Ann Arbor, USA

2013 - 2014 Independent University of Moscow, Moscow, Russia

2009 - 2013 Massachusetts Institute of Technology, Cambridge, USA

Awards

2020 - 2022 AMS-Simons Travel Grant

2019 - 2020 Rackham Predoctoral Fellowship, University of Michigan, Ann Arbor, USA

2013 AMS Math in Moscow Scholarship

Publications

A list is also available online

Journals

2025 A Ricci flow on graphs from effective resistance, accepted to J. Combinatorics,
  with Aleyah Dawkins, Vishal Gupta, Mark Kempton, William Linz, Jeremy Quail, and Zachary Stier

2025 Node resistance curvature in Cartesian graph products, accepted to J. Combinatorics,
  with A. Dawkins, V. Gupta, M. Kempton, W. Linz, J. Quail, and Z. Stier

2025 The family of a-floor quotient partial orders, in Proceedings of Combinatorial and Additive Number Theory VI,
  with Jeffrey Lagarias

2024 Lower rational approximations and Farey staircases, Integers 24

2024 The distribution of Weierstrass points on a tropical curve, Selecta Math. New Ser. 30

2024 The floor quotient partial order, Adv. Appl. Math. 153,
  with Jeffrey Lagarias

2023 The tropical Manin-Mumford conjecture, Int. Math. Res. Not. IMRN 2023.21

2023 Counting tripods on the torus, Arnold Math. Journal 9,
  with Jayadev Athreya and David Aulicino

2023 Derangements and the p-adic incomplete gamma function, Transactions of the American Math. Society 376,
  with Andrew O’Desky

2020 Dilated floor functions having nonnegative commutator II. Negative dilations, Acta Arithmetica 196.2,
  with Jeffrey Lagarias

2019 Dilated floor functions having nonnegative commutator I. Positive and mixed sign dilations, Acta Arithmetica 187.3,
  with Jeffrey Lagarias

2016 Dilated floor functions that commute, American Math. Monthly 123.10,
  with Jeffrey Lagarias and Takumi Murayama

Conference Proceedings

2025 Principal minors of tree distance matrices (extended abstract), FPSAC 2025,
  with Farbod Shokrieh and Chenxi Wu

2025 PhyloVAE: Unsupervised learning of phylogenetic trees via variational autoencoders, ICLR 2025,
  with Tianyu Xie, Jiansi Gao, Frederick A. Matsen IV, and Cheng Zhang

2022 Derangements and the p-adic incomplete gamma function (extended abstract), FPSAC 2022,
  with Andrew O’Desky

2019 The distribution of Weierstrass points on a tropical curve (extended abstract), FPSAC 2019

Preprints

2023 Tropical Weierstrass points and Weierstrass weights,
  with Omid Amini and Lucas Gierczak

2024 Counting two-forests and random cut size via potential theory,
  with Farbod Shokrieh and Chenxi Wu

2024 Principal minors of tree distance matrices,
  with Farbod Shokrieh and Chenxi Wu

2025 Vector encoding of phylogenetic trees by ordered leaf attachment,
  with Erick Matsen and Cheng Zhang

Service

Co-organizer

2024 JMM Special Session on Ricci Curvatures on Graphs and Applications

2018-2019 University of Michigan Student Combinatorics Seminar

Journal Referee

Annals of Combinatorics, Electronic Journal of Combinatorics, Journal of Integer Sequences

Contributor

SageMath, Ete Toolkit