Some of the projects I’ve worked on, and my areas of interest and expertise:
I was one of the first committers on Apache Hadoop, and worked on it and many other distributed systems projects in the Hadoop ecosystem for the best part of a decade while working at Cloudera. I wrote four editions of the bestselling book Hadoop: The Definitive Guide, published by O’Reilly.
In early March 2020 I began collating the disparate sources of UK COVID-19 data, by writing web crawlers to integrate the data for COVID-19 tests, confirmed cases, and deaths into a set of CSV files. My work has been used by many different individuals and organisations, including John Burn-Murdoch’s visualizations for the Financial Times.
In 2019 I produced the data analyses and visualizations of Welsh school funding data, for the Level the Playing Field campaign for fair funding for schools in Wales.
In 2020 I started a blog about data visualization with the goal of creating one interesting visualization per week - with no constraints on dataset, visualization type, or technology.
Over the years I’ve created many geometric visualizations in my spare time.