  Cem Tezer was a fastidious, meticulous, highly idiosyncratic and versatile
scientist. Without him Turkish community of mathematics would be incomplete.
Our sense of gratitude for his work in various areas of mathematics, history of
sciences, literature, music and his encouragement to do mathematics for only
its beauty was hardly unique and even unusual. After he passed away on 27
February 2020, while working actively at Middle East Technical University, the
number of colleagues and former students described the ways in which their
studies and indeed their view towards mathematics had been transformed by
having known him might have surprised only those who had never met him. In this
article not only, his contributions to mathematics will be classified and
summarized but also his unique and distinguished personality as a mathematician
will be emphasized.
