[5] Lee majored in mathematics graduating from Ewha Womans University with a B.S.
and then Northwestern University with a Ph.D.[6] After graduation, Lee returned to Ewha teaching and conducting research and in the Department of Mathematics.
In addition to her teaching responsibilities, she has held various other positions at Ewha; including president of the Graduate School Alumnae Association, director of both the Institute of Mathematical Science and Center for Entrepreneurship, CEO of Technology Holdings, vice president of research, and the 18th president.
[7] Outside of Ewha, she has been a board member of the Basic Science Academic Council (기초과학학회협의체) , Institute for Basic Science,[8] National Research Foundation of Korea, National Research Council of Science & Technology, Basic Research Advisory Committee of the National Science and Technology Advisory Council, Korea Federation of Women’s Science & Technology Association, and the Association of Korean Woman Scientist and Engineers.
She was also vice president of both the Korea Institute of Information Security & Cryptology (한국정보보호학회 부회장) and Volunteers for Educational Services in Asia, along with president of the Korean Mathematical Society[9] and the Korean Association of Mathematical Societies (한국수학관련단체총연합회 회장).