Joshua Day, PhD

My name is Josh. I work on all things technical/scientific computing, but my niche is the intersection of statistics and computer science. I'm good at solving problems and then converting whiteboard math into efficient programs. Julia is my favorite language. I obsess over two things in my projects: 1) Performance, and 2) Usability.

About Me

• I'm a Senior Research Scientist at Rallypoint One where I primarily do scientific software/data science R&D for government customers.
• I do a lot of open source development.
• I am the creator and main contributor to the Julia for Data Science newsletter.
• I have a PhD in Statistics from NC State. My research into on-line algorithms for statistics led to the development of the OnlineStats Julia package.

Things I've Built

• OnlineStats.jl: Single-pass algorithms for statistics and data viz with big data.
• PlotlyLight.jl: Lightweight, easy-to-use wrapper of the fantastic Plotly.js plotting library.
• XML.jl: An XML reader/writer in pure Julia that performs comparably to implementations in C.
• Cobweb.jl: An HTML reader/writer in pure Julia that's fast and easy to use.
• One Click Tuner: iOS app with a chromatic musical instrument tuner.
• XKCD.jl: Retrieve image and metadata from the XKCD webcomic.
• TokenIterators.jl: Fast framework for writing lexers/tokenizers.
• DepotDelivery.jl: Create a standalone Julia depot that can be used in air-gapped deploymet.
• And much more...