| • 1984 - 1985 | Syracuse City School District, Henninger High School, Special Education Teacher |
| • 1985 - 1988 | Research Assistant Syracuse University, The Syracuse Curriculum Project (Grant #G00-853-0151), U.S. Dept. of Education) |
| • 1991 - 1992 | Univ. Lecturer Ewha Womans University, Dept. of Special Ed. & Inchon Teacher's College, Dept. of Early Childhood Education |
| • 1992 - 2024 | Professor Ewha Womans University, College of Education, Dept. of Special Education |
| • 1994 - 2011 | A Consulting Editor of AAIDD’s a journal 『Intellectual and Developmental Disabilities』 (formerly 『Mental Retardation』) |
| • 1995 - 1997 | Dept. Chairperson Ewha Womans University Dept. of Special Education |
| • 1998 - 2004 | Member in Committee on Employment Promotion for the Disabled, Ministry of Labor |
| • 2000.2 - 2001.1 | Visiting Scholar supported by Korea Research Foundation University of Cambridge, U.K. School of Education, Shaftesbury Road, Cambridge CB2 2BX U.K. |
| • 2001 - the present | Operation of E-ACOLA(Ewha Academy for COmmunity Living of Adults with Developmental Disabilities) since September, 2001, The first college-based postsecondary education program for adults with developmental disabilities in Korea. Global School of Continuing Education, Ewha Womans Univ. |
| • 2002.11 - 2004.10 | Founding Editor-in-Chief, |
| • 2004.9 - 2006.9 | Member of the National Curriculum Review Committee, Ministry of Education, Korea |
| • 2005 - 2007 | Associate Dean Office of Planning & Coordination, Ewha Womans University |
| • 2005.10 - the present | Member of Committee Disability Discrimination Conciliation Committee, National Human Rights Commission of the Republic of Korea |
| • 2006.7 - 2008.6 | Vice President The Korean Society of Special Education |
| • 2006 - 2008 | Editor-in-Chief 『Korean Journal of Special Education』, The Journal of Korean Society of Special Education |
| • 2007.12 - 2008.7 | Visiting Professor National University Corporation Tokyo Gakugei University, Dept. of Special Needs Education, Tokyo, Japan |
| • 2008 - 2021 | Professional Advisor Support Center for Students with Disabilities(SCSD), Ewha Womans Univ. |
| • 2009.12 - 2011.12 | Member of Seoul Disability Employment Committee, Korea Employment Agency for Persons with Disabilities(KEAD) |
| • 2009 - 2018 | Founding Executive Editorial Board Member, 『Disability & Employment』, The Journal of Employment Development Institute, Korea Employment Agency for Persons with Disabilities(KEAD) |
| • 2009 - 2017 | Consulting Professor, Goyang Transition Education Support Center, Goyang City, Gyeonggi Province |
| • 2010 - 2012 | Director The Special Education Research Institute, Ewha Womans Univ. |
| • 2013.3 - 2023.12 | Development and teaching of the first introductory course of Disability Studies in Korea, “Disability & Society”, Selected through the Call for 2013 General Education Course Proposals of Ewha Womans Univ. |
| • 2015 - 2017 | Director Center for Child Development & Disability, Ewha Womans Univ. |
| • 2018 - 2020 | President The Korean Society of Special Eduaction |
| • 2023.3 - 2027.6 | Member of National Curriculum Committee National Education Commission of Korea First(23-25) & Second(25-27) term |