We are all deeply saddened by the sudden departure of our teacher,  mentor,  and  friend,  Professor  Ogbu  Kalu.    The  essays in  this volume serve as our testimony to his many years of scholarship in Africa, Europe and America.  They are written by his former students and associates to commemorate his intellectual acumen and  recognize the importance of his scholarly influence on all of us.

This series of articles is a sociological discussion of the religious interplay within the migratory experience.  As Ana Maria Bidegain and Juan Jennis Sánchez Soler state in their article, religion informs the migratory experience as they take with them their own experience, are encountered by foreign interpretations of religious experience, and build religious space to meet their need for religious experience.  In turn, migration informs religious experience, in that migrants must re-configure their current context with their religious difference.  Religion therefore is an integral part of sociological studies, and unfortunately, scarcely discussed or higlighted as a contributing factor to how one interprets who they are, what they do, and the space they develop.