The poster is Christian Rudder, one of the founders of OK Cupid, along with several of his Harvard buddies, who had previously worked together, a decade or so ago, to develop the SparkNotes study guides, and the procrastinate-from-studying humor site TheSpark.com, whose personality test, and subsequent, racier tests—the Purity Test, for instance—you may recall taking in a large group in your school library around the turn of the century. Rudder also plays in critically acclaimed and respected Brooklyn indie-rock band Bishop Allen with his Harvard buddy Justin Rice (and both Rudder and Rice have starred in films by the Harvard buddy Andrew Bujalski; Rudder was in Funny Ha Ha in 2002, a few years after graduation). All of which biographical information I've just browsed through, as I was wondering why the guy from Bishop Allen was doing witty pop sociology on an online dating site.
This is all commonly accessible knowledge, but still, I was not previously aware that one of the guys from Bishop Allen wrote The Spark's personality test. This is a lot like the time I belatedly found out that Hedy Lamarr invented wi-fi.