At an event hosted by the American Enterprise Institute in 2008, Richwine said Jews had the highest average IQs and singled out blacks and Hispanics as having the lowest IQs.

He said IQ differences "were not going to go away tomorrow" and "we have to address them in our immigration discussions and our debates."

The Washington Post first reported on Richwine's 2009 PhD dissertation, which argued the same position.