Upon receiving his Ph.D., he taught at the Eastern Kentucky University in Richmond for four years and returned to the University of Kentucky system in 1975 to 1987 where he was a full professor and a member of the University of Kentucky graduate faculty. He also taught at Northwestern University in Evanston, Illinois, Indiana University in Bloomington, and Pembroke State University in Pembroke, North Carolina. While in the United States, he was one of the founding members of the Association of the Korean Political Scientists in North America and served as its Secretary-General.[citation needed] Yang married after moving to the United States, and had two children there. He naturalised as a U.S. citizen in 1977.[1][6]
Yang returned to South Korea in 1986 as a visiting professor at Seoul National University. Later that same year, he accepted a professorship at the Graduate Institute of Peace Studies at Kyung Hee University, where he was an academic dean until 1996.[citation needed] He gave up U.S. citizenship in 1989.[1][6]
In May 2000, just in advance of the first Inter-Korean summit, South Korean newspapers began to report that Yang had been chosen as Seoul's next ambassador to the United States. Yang's appointment was a surprise due to his relative lack of political and diplomatic experience. Stratfor analysed Kim's choice to nominate Yang, along with the naming of four-decade career diplomat and trade expert Hong Soong-young as ambassador to Beijing, as part of an effort to push forward the Sunshine Policy: the posting to Washington of Yang, an expert on North Korean affairs, symbolised the autonomy of Seoul's policies towards Pyongyang, while Hong's role was to improve relations with Beijing and ensure its support for inter-Korean reconciliation.[9] Yang's term as ambassador came to an end in April 2003, when he was succeeded by Han Sung-joo.[10]
Later career
After leaving his ambassadorial post, Yang and his wife returned to South Korea.[10] He went on to become a professor at Korea University's Graduate School of International Studies.[1] He also served as the chairperson of the Kim Dae-jung Peace Foundation Advisory Committee from August 2007 to 2012.[citation needed]
Drs. Sung-Chul Yang and Daisy Lee Yang Lecture Series endowment fund agreement with UH Foundation, dated July 28, 2015(“Original Agreement) and amended gift agreement on June 8, 2021, was to support the promotion and advancement of Korean Studies at the Center for Korean Studies at the University of Hawaii at Manoa Campus. This lecture series was created to invite an eminent scholar of Korean or Asian affairs to deliver a lecture.
Selected works
English
Revolution and change: a comparative study of the April Student Revolution of 1960 and the May Military coup d'etat of 1961 in Korea. Doctoral dissertation. University of Kentucky. 1970. OCLC9114852.
Revolution and change: a comparative study of the April Student Revolution of 1960 and the May Military coup d'etat of 1961 in Korea. Seoul: Korea University Press. 2015. ISBN978-89-7641-892-0.
Korea and Two Regimes: Kim Il Sung and Park Chung Hee. Cambridge, Massachusetts: Schenkman Publishing Co. 1981. ISBN978-0-87073-605-6. OCLC6708895.
Polemics & Foibles: Fragments on Korean Politics, Society and Beyond. Seoul: Seoul Press. 1998. ISBN978-89-7225-089-0. OCLC43308171.
As editor. Democracy and Communism: Theory, Reality and the Future. The KAIS International Conference Series No. 3. Seoul: The Korean Association of International Studies. 1995. OCLC45268467.
With James Lilley et al. Ambasadors' Memoir: U.S.-Korea Relations Through the Eyes of the Ambassadors. Washington, D.C.: Korea Economic Institute. 2008. ISBN978-0-9747141-5-8.
Korean
With Pak Han-sik et al. 북한 기행: 재미 한국인 학자 9인이 본 80년대 북한 [A Journey to North Korea: 1980s North Korea as seen by nine Korean scholars from the U.S.]. Seoul: 한울출판사. 1986. OCLC19388626.
남북통일 이론의 새로운 전개 [A New Approach to Unified Korea]. 통일연구 시리즈 no. 5. Seoul: 경남대학교 극동문제연구소. 1989. OCLC22827347.
With Park Sung-Jo. 독일통일과 분단한국 [United Germany and Divided Korea]. 통일연구 시리즈 No. 6. Seoul: 경남대학교 극동문제연구소. 1991. OCLC27851661.
한국정부론:역대정권 고위직 행정엘리트 연구(1948-1993) [On The Government of the Republic of Korea: A Study of Top Administrative Elites from 1948 to 1993]. Seoul: Pakyong-sa. 1994. ISBN89-10-40082-X.
북한정치 연구 [A Study of North Korean Politics] (2nd ed.). Seoul: Pakyong-sa. 1995. ISBN89-10-40091-9.
Co-edited with Kang Sung-hak. 북한외교정책 [North Korea's Foreign Policy]. Seoul: Seoul Press. 1995. ISBN89-7225-059-7.
With Lee Yong-pil. 북한체제변화와 협상전략 [Negotiation Strategy to Transform the North Korean Political System]. Seoul: Pakyong-sa. 1996. ISBN89-10-40093-5.
삶의 정치:이제 정치도 새롭게 태어나자 [Politics for Every Day Life]. 서울 프레스. 1997. ISBN89-7225-082-1.
물구나무서기 정치 [On Topsyturvy Politics]. 서울 프레스. 1998. ISBN89-7225-091-0.
통일:우리도 분단을 극복할 수 있다, Volume I and II [Unification:We Can Overcome Division]. 서울 프레스. 1999. ISBN89-7225-113-5.
^Kim, Seung-hun (23 July 2007). "양성철 전 주미대사, DJ 오키나와 여행 동행기" [Former ambassador to U.S. Yang Sung-chul will accompany DJ on Okinawa trip]. The Dong-A Ilbo. Retrieved 17 October 2013.
^ abNam, Chan-soon (12 June 2000). "양성철씨 가족의 국적" [Citizenship of Yang Sung-chul's family]. The Dong-A Ilbo. Retrieved 17 October 2013.; quote: "양성철(梁性喆)주미 대사 내정자와 그 가족들의 국적 문제가 시빗거리가 되고 있다. 그는 77년 미국 국적을 취득했다가 12년만인 89년 이를 포기, 한국 국적을 회복했고 이어 15대 국회에 진출한 사람이다." ["The citizenship issues of Yang Sung-chul, the nominee for Ambassador to the U.S., and his family are becoming a matter of controversy. He obtained U.S. citizenship in 1977 and gave it up 12 years later in 1989, and resumed his South Korean citizenship and became a member of the 15th National Assembly."]