Pinkerite noted the high number of Reason magazine contributors associated with the Thomas Chatterton Williams-led Harper's letter, back in July.
So this latest news is not surprising:
Author and journalist Thomas Chatterton Williams joins the American Enterprise Institute
I think it's likely that the Harper's letter was Williams' audition, to show he was sufficiently on board the free speech grift, to be worthy of a post at AEI.
Reason magazine, like the American Enterprise Institute, is heavily funded by Charles Koch.
Williams is now part of the wingnut welfare system, AEI division, along with IDWs Charles Murray and Christina Hoff Sommers.