For the mathematical community, Kustaa Inkeri is the author of significant papers on number theory, especially on topics related to Fermat's Last Theorem. Finnish mathematicians know Inkeri as the founder of the school of number theory in Finland. At the University of Turku, many of us still think of Inkeri as the Head of the Mathematics Department, a position he held for about 20 years.
The present contribution is intended to give a picture of the man behind these achievements. So this is an essay expressly about the person of a mathematician and no attempt will be made to describe or sum up Inkeri's mathematical work. For an appreciation of the latter the reader is asked to take advantage of the rich material in the rest of this volume.

