James Fennell

Posts · GitHub · hello@jpfennell.com

Software developer and mathematician in Brooklyn, New York City.

Software/General

• Hoard is a distributed fault-tolerant system for collecting data feeds, written in Go. I currently have a three replica deployment collecting NYC transit data.

Software/Transit

• Transiter is a web service that subscribes to realtime transit data feeds and provides views of the data through a REST API. Demo site.

• PATH Train GTFS Realtime is a Go application that generates a GTFS Realtime feed for the PATH train system in New York and New Jersey.

• The realtimerail.nyc Typescript/React webapp displays train times for the NYC Subway. Despite being branded, it’s fully open source (repository).

Software/Typesetting

• Texcraft is a project to create an LLVM-style infrastructure for building TeX engines in Rust. Check out the Texcraft playground.

• Linux and Mac installer for Michael Spivak’s MathTime Professional 2 fonts for Latex. There’s a free version of the fonts, so you have no excuse to continue using the overbearingly ubiquitous Computer Modern.

Mathematics

I obtained my PhD in mathematics from the Courant Institute, New York University, in 2018. My adviser was Pierre Germain. My thesis is entitled Two topics in the theory of nonlinear Schrödinger equations (PDF download). Doctorate publications:

• Equivariant heat and Schrödinger flows from Euclidean space to complex projective space (Arxiv).
• Resonant Hamiltonian systems associated to the one-dimensional non-linear Schrödinger equation with harmonic trapping (Arxiv).

I did my undergraduate degree at University College Cork in the Irish city where I grew up.