Inside Johannes Gutenberg University Mainz's largest research partnership: Heidelberg University

Behind Johannes Gutenberg University Mainz's research output sits a defining relationship: 2,320 co-authored works with Heidelberg University (Germany) in the five years to 2025, the university's single largest collaboration.

It anchors an unusually connected research base: 1,094 collaborating institutions across 79 countries, producing 34,845 joint works over the window, with international co-authors on 47% of output.

The collaborative work travels: its field-weighted citation impact stands at 3.25, 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.