Also during this time he held guest professorships and teaching positions in Switzerland and in Asia (foremost in Sri Lanka, 1982/3).
Its many projects have aimed at developing an ecumenically oriented church history that pays proper attention not only to the denominational, but also to the geographical and cultural-contextual plurality of world Christianity.
Regular research stays and lecture trips led him to Asia, Africa and Latin America.
Koschorke has been appointed guest professor at Liverpool Hope University (UK) in 2010[4] and at the University of Basel (Switzerland, 2014–2018) and has been serving as visiting professor in Sri Lanka (since 1982), India (Madurai), China (Shanghai, Beijing, Hangzhou), Japan (Tokyo, Kyoto), Korea (Seoul), Myanmar (Mandalay) Singapore, Pakistan (Lahore), South Africa (Pretoria), Uganda and delivered repeatedly lectures in Brazil and in the United States.
In 2020 he was appointed Senior fellow at the KFG “Polycentricity and Plurality of Premodern Christianities” at the History Dept.