Choi, who has a doctorate in management from Mannheim University, Germany, has had a long association with railways. She was a professor at the Korea National Railroad College from 1997 to 2004, and its president from 2007 to 2011.
Choi was the chair of the performance evaluation committee with the former Koran National Railroad (KNR) in 1999, and a member of the rail industry restructuring committee with the Ministry of Construction and Transport in 2001. She rejoined KNR in 2003 as chair of the fare policy committee, before becoming deputy administrator in 2004. Choi was appointed vice-president of Korail in 2005, a position she held until 2007.
In 2009 Choi served as the chair of the International Association of Railway Universities and Organisations, and this year she was appointed vice-chair and director of the Korean-German Academy of Economics and Management (KDGW).