Steven Pinker is a professor who teaches psychology classes and conducts research on language and the human mind.

Judged as of 2011-10-06. True: official records (Harvard faculty pages or announcements) show that in October 2011 Pinker was a professor teaching psychology courses and doing research on language and the mind. Mostly true: he held the post and did that research, but a minor detail is off (for example, he was on leave from teaching that term). Mixed: only one of the two parts held. Mostly false: he held an academic affiliation but was not teaching or researching in these areas. False: he was not a professor at that time.

Set before the research began.

1. E1 Steven Pinker wins George A. Miller Prize in Cognitive Neuroscience — Harvard Gazette Harvard Gazette (Harvard University) · 29 April 2010

   “Pinker, who conducts research on language and cognition, delivered the George A. Miller Lecture on April 18 at the annual meeting of the Cognitive Neuroscience Society.”

2. E2 The Cognitive Revolution — Harvard Gazette Harvard Gazette (Harvard University) · 13 October 2011 Own record

   “Johnstone Family Professor of Psychology”

3. E3 Classes | Steven Pinker Steven Pinker (stevenpinker.com) Own record

   “To be given in 2011–12. Limited to first-year doctoral students in Psychology.”

A Harvard Gazette item from 13 October 2011 [E2] names Pinker as the Johnstone Family Professor of Psychology, so he held a professorship at the time of the claim. A Harvard Gazette report from April 2010 [E1] describes him as someone who "conducts research on language and cognition." His own class listing [E3] shows a psychology graduate proseminar scheduled for 2011–12, which supports the teaching part, though it gives no specific term. Taken together, the evidence supports both parts of the claim as of October 2011.