Chia-Yi Yen, you can call her "Yen" just like the Japanese dollar yen, is a financial engineer in Taiwan local hedge fund. She has been responsible for multi-factor model construction, data infrastructure, data Extract-Transform-Load solution, and other numeric analysis projects. She is active in many open-source communities like Python and R, and she is also the organizer of Taiwan R-Ladies community, which is a female meetup of everything about data in the world of R language.