I’m a software engineer working at Posit, PBC . 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.