Uluğ Çapar is an emeritus professor of mathematics from Sabancı University in Istanbul, Turkey. His first degree was in engineering with continuum mechanics as option. Two professors influenced him to reshape his professional career as a mathematician. The first one was the most celebrated Turkish mathematician Cahit Arf. The second one was Jan Mikusinski, a leading figure of the theory of generalized functions (distributions). The subject has become part of the author’s lifetime academic occupation except that his interests have shifted in the long run to its nonlinear and random versions. He was a student in graduate courses offered by both of them. Prof. Arf would also become his colleague in his last years at the Middle East Technical University (M.E.T.U.), Ankara.