Jacob Richey

I am a postdoc in the math department at NYU Shanghai, working with Alejandro Ramirez. My research is on combinatorial probability, including models related to network science, statistical physics, dynamical systems, and machine learning.

From 2023–2026, I was a visiting researcher at the Alfréd Rényi Institute of Mathematics in Budapest. From 2020–2023, I was a postdoc in the probability group at the University of British Columbia. Before that, I earned a PhD in Mathematics from the University of Washington and a BA in Mathematics and Chinese language from Dartmouth College.

Email: jfr9718 [at] nyu [dot] edu
Jacob Richey

Scroll for research, teaching, and other interests

Research in Probability and Combinatorics

My research focuses on discrete structures, usually from a probabilistic or combinatorial perspective. Recent topics include: activated random walk and self-organized criticality, interacting particle systems, pattern avoidance and shifts of finite type, random matrices, mixing times for stochastic diffusions, stochastic geometry.
Toppling-count heat maps for subcritical, near-critical, and supercritical stochastic sandpiles on a large two-dimensional torus
Subcriticalρ = 0.58 Critical windowρ ≈ ρc(ℤ2) ≈ 0.72 Supercriticalρ = 0.78 Odometers for point source activated random walk with subcritical/critical/supercritical background density

Teaching & Mentoring

I am passionate about sharing mathematical ideas and puzzles with the people around me, including students at all levels. Over the years I have collected many mathematical riddles, physical puzzles, and group activities in fields like number theory, topology, algebra, and probability. I have a special place in my heart for number theory and probability, which were my entry points to the world of mathematics as a youth.
Four playful mathematics visuals: the five-card trick, a logic circuit, Hackenbush, and a physical quaternion string demonstration
Five cards, logic gates, Hackenbush, and Quaternions—from the Math Circle collection.

Bridge

I am a recovering bridge addict. I played for the Dartmouth team from 2012-2014, and the University of Washington team from 2014-2016. As a student, I wrote a practical bidding guide plus a collection of short, mildly comedic articles to teach rare declarer situations and defensive techniques.
A bridge problem asking whether six hearts can be made from two displayed hands
The position in The dummy reversal, one of my card-play essays.
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