Inside Yale University's largest research partnership: Harvard University

Behind Yale University's research output sits a defining relationship: 5,471 co-authored works with Harvard University (United States) in the five years to 2025, the university's single largest collaboration.

It anchors an unusually connected research base: 1,169 collaborating institutions across 81 countries, producing 113,000 joint works over the window, with international co-authors on 36% of output.

The collaborative work travels: its field-weighted citation impact stands at 3.6, where the world average is 1.0.

The Research Collaboration Index, the first global account of how universities actually collaborate, publishes its first full edition on Tuesday 15 September at 09:00 UK.

Every figure derives from the open global research record and is checkable at source.