Eui-Sook, Park is a vice chairman of SeAh holdings, a Korean conglomerate with over thirty affiliates, manufacturing the core steel materials used in automobiles, ships, heavy machines, energy production and construction. As vice chairman, she has been in charge of strategic decision making to maximize the value of group. Before everything else, new business opportunities have been proactively developed to find growth breakthrough; investing in funds, and startups. Eui-Sook is also president of SeAh foundation, established in honor of Woon-Hyung Lee, the late chairman of the group and her husband in 2013. As president of SeAh foundation, she has provided support to promising opera singers and supported academic research for musicologists. In the early 1990's, she founded SeAh metal, offering stainless steel wire and auto parts, and SeAh Networks, providing IT services and technology. She is currently leading and managing the businesses of two firms. Eui-Sook has been active on social contributions; donations to establish the Korean museum at the University of Michigan and to install a pipe organ for Jeong-Dong church, which is one of the most historic church in Korea. She holds a B.S from Ewha University, and MBA from Yonsei University in Korea.