The cities of Heidelberg and Mainz want to work closely together in the future: Their aim is to further develop the Neckar-Rhine-Main region as an international innovation and biotech region. To this end, Heidelberg Mayor Würzner and Mainz Mayor Haase signed a MoU at Heidelberg City Hall on Friday, April 24, 2026. Those responsible for the central innovation and development structures of both cities also took part in the signing.