Debra Bergen Koster (known as Debra Bergen) is a retired labor organizer and labor educator. She entered the labor movement as an organizer in the 1980s with SEIU District Council 925 and NYC Women Office Workers, a local of 9to5, National Association of Working Women. From 1983 to 1986 she then organized and represented home care and hospital workers with Local 1199, National Union of Health Care and Hospital Employees (SEIU 1199). Beginning in 1987 she held the position of Contract Administrator at the Doctors Council, SEIU. Koster later served as the Director of Contract Administration for the PSC/CUNY, Local 2334, NYSUT, AFT from 1991-2018. For 20 years she was an Adjunct Instructor in the Cornell NYS ILR Trade Union Certificate for Women and Labor Studies programs and co-coordinated and taught at the United Association for Labor Education (UALE) Union Summer Schools for Working Women. The Debra Bergen Koster Papers (dated 1977-2013) consists of materials created and collected by Koster documenting her activities as a labor organizer and labor educator, with particular emphasis on fair contract negotiations and support for women workers on issues such as pay equity, discrimination, and sexual harassment. Materials documenting Koster's activities as a labor educator include course materials and notebooks, many of which are from Cornell University's Trade Union Studies Program. This collection also includes materials documenting union leadership campaigns and elections through ephemera, petitions, and correspondence. Materials documenting her organizing activities and contract administration with Local 1199, National Union of Hospital and Healthcare Workers include correspondence, background subject files, and a signed summary of tentative agreement.