Prof. Anita Bernstein, Brooklyn Law School, Brooklyn, New York (April 2023)

Prof. Diego Zegarra Valdivia, Profesor Principal de Derecho Administrativo, Pontificia Universidad Católic, Peru (April 2023)

Dr. Dennis Agelebe, Nigeria

Armelle Demanou Solefac, University of Dschang, Cameroun (October 2022 - February 2023)

Prof. Shamita Kumar -  Vizedirektorin des BVIEER (Bharati Vidyapeeth Institute of Environment Education and Research), Pune, Indien (October - November since 2013, whole winter semester 2017)