Yes, Trita Parsi Co-Founded the Quincy Institute — The Claim Is Correct

The claim is straightforwardly true. Trita Parsi is a co-founder of the Quincy Institute for Responsible Statecraft, a think tank launched in 2019 that promotes diplomacy and restraint in U.S. foreign policy over military intervention.

The Quincy Institute's own About page lists Parsi as both a co-founder and its Executive Vice President. That's about as direct a confirmation as you can get. Independent reporting backs it up too — Politico covered the think tank's launch in November 2019 and named Parsi as one of its founders alongside Andrew Bacevich, a well-known military historian and critic of American interventionism.

The Nation also identified Parsi as a co-founder in its coverage of the institute, and Wikipedia's article on the organization is consistent with all of the above. Multiple independent sources pointing to the same fact is a good sign you're on solid ground.

One place confusion might creep in: Parsi was previously best known as the founder of the National Iranian American Council (NIAC), an advocacy group focused on Iranian-American issues. His move to co-found a broader foreign policy think tank may have caught some people off guard, leading to uncertainty about his current role.

This is a case where the claim holds up completely. When checking facts about think tanks or policy figures, the organization's own website is a reliable first stop — and here it aligns perfectly with outside reporting.