I’m a software engineer working at RStudio, Inc. I earned my PhD from the Department of Statistics, Iowa State University. My thesis was Dynamic Graphics and Reporting for Statistics, advised by Di Cook and Heike Hofmann. I have developed a few R packages either seriously or for fun (or both), such as knitr, animation, bookdown, blogdown, pagedown, xaringan, and tinytex. I founded a Chinese website called “Capital of Statistics” in 2006, which has grown into a large online community on statistics. I initiated the Chinese R conference in 2008. I’m a big fan of GitHub, LyX and Pandoc. I hate IE. I fall asleep when I see beamer slides, and I yell at people who use \textbf{} to write \title{}. I know I cannot eat code, so I cook almost every day to stay away from my computer for two hours.