# YoungJu Choie

June 15, 1959 -

**Contributed by Chaeyoung Kim, Phillips Exeter Academy, Exeter NH**
YoungJu Choie is a South Korean mathematician whose work covers number theory and
modular forms. Choie has proved upper bounds on the first sign change of Fourier coefficients
of cusp forms.

Graduating from Ewha Woman's University in 1982 and receiving her Doctorate at
Temple University, Choie now works as a professor of mathematics at Pohang University of
Science and Technology (POSTECH).

Choie recently ran a 2021 campaign called “She Did It” which advocated for women
scientists in Korea. In Choie’s early stages of mathematics, she faced shock and judgment for
her identity as an Asian, woman mathematician, of which there were only five in Korea during
the 1980s.

Choie became a Fellow of the American Mathematical Society (AMS) in 2013 due to her
expansions on Jacobi forms. Choie has a lengthy list of achievements including editor of the
International Journal of Number Theory, Editor-in-Chief of the Bulletin of the Korean
Mathematical Society, and President of the society of Korean Women in Mathematical Sciences.
Choie has also received many acclaimed titles such as "The best Journal Paper Award (2002)"
from the Korean Mathematical Society, "The best woman Scientist of the year" award (2005) from
the Ministry of Science and Technology, and "Amore-Pacific The best Women in Science and
Technology" (2007), KOFWST (Korea Federation of Woman's Science and Technology Association).
On top of this, Choie was also the first female mathematician to become a member of the
Korean Academy of Science and Technology.

### References

- YoungJu Choie, Wikipedia, https://en.wikipedia.org/wiki/YoungJu_Choie
- "She Did It" Blog, https://m.blog.naver.com/wisetter/222320017405
- "South Korean Mathematician YoungJu Choie", https://peoplepill.com/people/youngju-choie