Hadley Wickham, RStudio's Chief Scientist and prolific author of R books and packages, conducted an AMA (Ask Me Anything) session on Reddit this past Monday. The session was tremendously popular, generating more than 500 questions/comments and promoting the AMA to the front page of Reddit.
If you're not familiar with Hadley's work (which would be a surprise if you're an R user), his own introduction in the Reddit AMA post will fill you in:
Broadly, I'm interested in the process of data analysis/science and how to make it easier, faster, and more fun. That's what has led to the development of my most popular packages like ggplot2, dplyr, tidyr, stringr. This year, I've been particularly interested in making it as easy as possible to get data into R. That's lead to my work on the DBI, haven, readr, readxl, and httr packages. Please feel free to ask me anything about the craft of data science.
I'm also broadly interested in the craft of programming, and the design of programming languages. I'm interested in helping people see the beauty at the heart of R and learn to master it as easily as possible. As well as a number of packages like devtools, testthat, and roxygen2, I've written two books along those lines: Advanced R, which teaches R as a programming language, mostly divorced from its usual application as a data analysis tool; and R packages, which teaches software development best practices for R: documentation, unit testing, etc.
Check out the comments at the link below, where you'll find insights from Hadley on the best way to teach R, Big Data in R, the elegance (or otherwise) of the R language, being productive, the best BBQ, and much more.