Me inside Jesus Rafael Soto's 'Penetrable BBL Blue 2/8' at the Perez Art Museum in Miami

Theo Johnson-Freyd

Perimeter Institute for Theoretical Physics

Brief bio

My research focuses on "homotopical physics": the interplay between mathematical physics (particularly quantum field theory) and higher (aka categorical) algebra. Other buzzwords that describe my work: higher symmetries, topological field theory, phases of condensed matter, "moonshine" phenoma, perturbative quantization, categories, representation theory, and algebraic topology. For more details, see my Research Statement (PDF), read my publications, or watch my seminar presentations. You may also read my Curriculum Vitae (PDF).

I received my PhD from UC Berkeley in 2013, under the supervision of Nicolai Reshetikhin. I was then an NSF postdoc and Boas Assistant Professor at Northwestern University. I am now a Senior Postdoctoral Fellow at the Perimeter Institute. My postdoc mentors are Kevin Costello and Davide Gaiotto. Other collaborators include Alex Chirvasitu, Owen Gwilliam, Claudia Scheimbauer, and David Treumann.

Graduate students: Jessica Weitbrecht (MSc 2018).

I used to be a dancer. I choreographed the 2007 Stanford Viennese Ball opening ceremonies.

My husband and I are avid cooks. Unless you are immediate family, we will not cater your wedding cake.

The Perimeter Institute is on lands deeply connected to the Indigenous people who have lived and still live in the Waterloo region, including the Neutral, Anishinaabeg, and Haudenosaunee peoples. The Perimeter Institute is situated within the Haldimand Tract, land promised to the Six Nations.