i am a principal research scientist at microsoft research in new york city, where my work in the area of computational social science involves applications of statistics and machine learning to large-scale social data. i am also an adjunct assistant professor in columbia university's applied math department and i run the microsoft research data science summer school to promote diversity in computer science. i was previously a member of the social dynamics group at yahoo! research. i received my ph.d. from columbia university's physics department. see my curriculum vitae for more information.

this site serves several purposes, from presenting and organizing my current research and teaching efforts to publishing code and tips that i hope others will find useful.

i bookmark lots of references on pinboard, occasionally tweet things, post random tidbits on tumblr, and share photos on flickr.

latest tips

my latest geek tips, also available on twitter, tumblr, or as plain text:

apache applescript awk bash bibtex c c++ consumer css cu cvs debian emacs excel firefox flickr gcc gentoo ggplot git gmail google grammar graphviz hadoop html idvd imagemagick iphone iphoto ipod irc itunes java javascript juypter keynote latex lifehack linux mac macosx markdown matlab meta mobile mturk mysql network networking perl php powerpoint python quicktime razr rss rstats rsync ruby safari search sed sge shell silverlight sms sql ssh svn test trac treo unix use video windows word wordpress x11 xml shell: convert a movie to an animated gif with ffmpeg and imagemagick http://bit.ly/2QRs6zA powerpoint: jump directly to a slide by typing its number + enter while presenting (h/t @dggoldst) latex: set frame counter manually to avoid counting backup slides in beamer http://bit.ly/2JM9igW shell: find symbolic links with find . -type -ls or ls -lR | grep ^l http://bit.ly/31A259S rstats: knit a regular R script to html with knitr::stitch("script.R") http://bit.ly/2IxcT1N