Matt Dowle: fast and flexible data manipulation with data.table

Matt Dowle's background is investment banking and hedge funds in London, quantitative equity research and trading both low and high frequency. He has been using S-PLUS since 1996 and R since 2002, and he is currently taking a career break and working on his well-know and extremely useful data.table package:

The data.table package (https://github.com/Rdatatable/data.table) is one of the most useful additions to base R and it offers fast aggregation, ordered joins and add/modify/delete of columns by group of large datasets up to tens or hundreds of gigabytes of data in a very efficient way with a brief and flexible syntax. In short, you should come and learn about data.table if you will ever deal with data larger than mtcars.