Hyunjung Choi studied music at Yonsei University, Seoul, Korea, with concentration in Pipe Organ Performance. She continued to study Choral Conducting at Golden Gate Baptist Theological Seminary in Mill Valley California and also worked with renowned conductors such as Dr. Solomon of San Francisco Bach Choir.

Hyunjung performed Vivaldi’s Magnificat in 2013, Mozart’s Coronation Mass in 2014, and Vivaldi's Gloria in 2015. She also directed the choir to benefit many charitable foundations such as American Cancer Society and Oakland Children's Hospital. Hyunjung’s musical passion led her to various music conferences and choral festivals such as American Choral Directors Association, and Bachstiftung in Trogen, Switzerland.

The Pacific Choir performs various repertoires from Baroque to Contemporary Choral works including American Jazz and Original Pop arrangements. Hyunjung's choir not only performs classical choral music but also introduces the contemporary Asian choral works to the audience in North America. Her choir was invited to perform at United Nations 70th Anniversary at Grace Cathedral, San Francisco in 2015. Recently, she performed Bach's Cantata 80, Ein feste Burg ist unser Gott, to commemorate the Reformation 500 through the collaboration with Evangelical Lutheran Church in America in 2017.

Hyunjung Choi currently serves Mt. Tamalpais United Methodist Church, Mill Valley, CA, as Church Music Director.