Prof. Yun Sung Choi (MATH) was chosen as the winner of the 2015 Academic Achievement Award by the Korean Mathematical Society. Prof. Choi has been working on properties of analytic functions defined in infinite dimensional vector space and geometrical properties of Banach space. The award denotes his contribution and dedication to the development of science by making outstanding accomplishments in the field of mathematics. The award ceremony was held on Oct. 24 at Yonsei University.