Hoonseok Oh
Head of School
hoh@sejongacademy.org

Mr. Oh has been part of Sejong Academy since 2019, where he teaches science and leads the Upper School Science Department. He also serves as the PLC lead, IB Middle Years Programme (MYP) Coordinator, and a Teacher Board Member. He also continuously contributed to school finance, such as grant writing, so that the school could get additional revenue to help students, teachers, and the learning community. With degrees in Science Education and Special Education, and advanced studies in STEM education and school administrative leadership, Mr. Oh is passionate about creating engaging, rigorous learning experiences for all students.

He has helped raise Sejong’s student achievement through high expectations, instructional support for teachers, and programs that connect learning to real-world opportunities. Mr. Oh also coordinates Sejong’s annual Korea trip and supports gifted learners through his role as Minnesota’s coordinator for the U.S. National Chemistry Olympiad under the American Chemical Society.

Beyond his education, Mr. Oh served in the Republic of Korea Army from 2013 to 2015, representing one of the United States’ closest allies.

Dedicated to both student success and Korean immersion, Mr. Oh believes in building strong relationships with students, families, and staff to make Sejong “an even better place than it was yesterday.”

Kate Brogan
Dean of Students
kbrogan@sejongacademy.org

Mrs. Brogan graduated with her master’s degree in school counseling in May of 2022 from the University of Wisconsin River Falls and was thrilled to start as the Lower School Counselor at Sejong shortly after. She grew up in Saint Paul and went to college at Cornell College in Mount Vernon, Iowa. After she graduated, she moved back to Saint Paul and has been here since. This August she got married and her new last name is Brogan-Brown but students still know her as Mrs. Brogan! She loves reading, coffee, and spending time with her loved ones.

Hyein Lee
Lower School Instructional Coach and District Literacy Lead
hyeinlee@sejongacademy.org

Hyein Lee, a graduate of Sookmyung Women’s University (B.Mus.) and Yonsei University (M.Mus.), brings over 20 years of teaching and performance experience to Sejong Academy. Since joining the school, she has served as a kindergarten teacher, Korean Language Coordinator, PLC Leader, and Elementary Lead Teacher. Known for meeting each student at their individual level and helping them grow to their full potential, she now serves as the Lower School Instructional Coach and Elementary Division Lead. In this role, she supports teachers through professional development, curriculum planning, and instructional guidance. Guided by Sejong Academy’s mission, she is committed to helping students become bilingual, biliterate, and bicultural learners who are confident, curious, and connected to both Korean heritage and the wider world.

Yejin Hong
Director of Korean Immersion Program & Upper School Korean Language Arts Teacher
yhong@sejongacademy.org

Ms. Hong grew up in Seoul, Korea, and studied journalism and mass communication at Sogang University. Before moving into education, she worked in online media, cultural research, and international non-profit organizations. She later earned her master’s and doctoral degrees at the Hubbard School of Journalism and Mass Communication at the University of Minnesota. Now in her fifth year of teaching Korean at Sejong Academy, Ms. Hong serves as the Director of the Korean Immersion Program. She enjoys helping students discover the joy of language learning and finds it exciting to see how learning Korean can open new perspectives and connections to the wider world. Over the years,

Suhyun Na
Special Education Assistant Director
sna@sejongacademy.org

Suhyun Na was born and raised in Korea. She studied special education at Ewha Womans University of Korea at BA, MA, and Doctorate level. Before moving to the US, she worked as a special education teacher, taught at colleges for many years, carried out lots of research and published some books/journals about special education. It has broadened and deepened her knowledge and experience. At Sejong, she worked as an ADSIS Reading teacher, ADSIS coordinator, Reading Corps coach and special education teacher. As a leader of the Special Education team, she will take responsibility for overseeing and managing all Sejong’s special education system including program development, service delivery, staffing, compliance, and budgeting. Also, she will serve as an Administrative Designee at IEP and Evaluation meetings, supervise special education staff and try to  meet the diverse needs of all students with disabilities continuously.