David Wittenburg (PhD, Economics, Syracuse University), a disability area director at Mathematica, has worked on several research initiatives to improve adult outcomes of youth receiving Supplemental Security Income (SSI). He has worked on multi-site demonstration and research projects related to youth over the past 20 years. This work includes evaluation and policy research for several federal agencies, including the Social Security Administration, Health and Human Services, and Department of Labor. Dr. Wittenburg has used a combination of evaluation methods drawing from survey, administrative, and qualitative data. Of relevance to this project is his evaluation and substantive work on the SSI child program, including testimonies before Congress, as a panel member for the National Academies of Sciences, Engineering, and Medicine (NASEM), journal articles, special journal volumes, reports, and policy briefs. Dr. Wittenburg is a member of the National Academy of Social Insurance and was formerly a senior associate at the Urban Institute and the Lewin Group. He also serves as co-president for the Board of Trustees for the Court Appointed Special Advocates of Mercer/Burlington County, which is an organization that provides supports to youth in foster care. Dr. Wittenburg co-authored the forthcoming chapter volume “Youth Transition” and presented it with Gina Livermore at Lessons Learned from SSA Demonstrations: A State of the Science Meeting.