On May 14, 2018, Marinus van IJzendoorn celebrated his 66th birthday which unfortunately also was the obligatory retirement age in the Netherlands for his age cohort. He became an emeritus professor at Leiden University where he remains involved in several research programs, among others the Leiden Consortium for Individual Development (L-CID as Scientific Consultant), 3G Family Lab, and Father Trials. These research projects partly moved to the Vrije Universiteit Amsterdam where Marian Bakermans-Kranenburg was appointed in the Faculty of Behavioural and Movement Sciences, Department of Clinical Child and Family Studies.

At Erasmus University Rotterdam he is a professor of human development in the Department of Psychology, Education, and Child Studies (DPECS) for 1 day per week until 2023, and he is one of the co-leaders of Generation R (Erasmus Medical Center).

From 2017 to 2020 he was a Honorary Senior Visiting Fellow, Department of Public Health and Primary Care, School of Clinical Medicine, University of Cambridge, UK, and he was in 2019 Visiting Fellow at Sidney Sussex College, working in the Applied Social Sciences Group headed by Robbie Duschinsky.

In December 2020 he was invited to be a honorary Visiting Professor in the Department of Clinical, Educational and Health Psychology, Division on Psychology and Language Sciences, Faculty of Brain Sciences, UCL, University of London, London, UK.