# Jacob Calvert

I am a PhD student at UC Berkeley working in the areas of probability and data science. Recently, I have been studying a class of random processes that exhibit a remarkable phase transition observed in natural collectives. To learn more, check out Papers or Posts.

# A conjecture about harmonic measure

Given finite $A \subset \mathbb{Z}^2$, the harmonic measure of $x \in A$ is the probability that a simple random walk “from infinity” first visits $A$ at $x$. If $A$ has $n$ elements, what is the smallest positive harmonic measure that you can get?

# Numerosity-driven phase transitions

This post discusses the intersection of some of my recent and forthcoming work in probability theory with studies of programmable matter and ant colonies.