RESEARCH INTERESTS
I study well-being and service use among immigrant and racial, ethnic, and linguistic minority populations, and how digital technology is reshaping access, delivery, and implementation of care for these groups. My work spans three levels of the care system: (a) the delivery system, including workforce composition, the availability of culturally and linguistically concordant care, and state-level policy environments; (b) the populations, including their well-being, coping, help-seeking, informal care networks, and use of digital and AI-mediated resources; and (c) the practitioners, including capacity-building and intervention development for culturally and linguistically appropriate services. Across these three levels, I approach care delivery as a question of equity and implementation: how interventions reach, adapt to, and are sustained in communities that have been marginalized and underserved.
I combine quantitative and computational methods with community-engaged research approaches. Within social work and migration studies, I am especially interested in natural language processing (NLP) and large language models across research, practice, and education: in research, as methods for studying diverse populations; in practice, as technologies that shape assessment, documentation, and decision-making; and in education, as a growing area of training for the profession.
CURRENT PROJECTS
Language access as a structural determinant of immigrant wellbeing

More than 25 million people in the United States, roughly 9 percent of the population over age five, speak English less than “very well,” and that population has grown substantially since 1990[1]. Language barriers are a documented obstacle to health and social services, including mental health care, for immigrant and refugee populations, alongside cost, insurance, stigma, and the limited availability of language-concordant services[2][3]. Title VI of the Civil Rights Act of 1964 and Section 1557 of the Affordable Care Act require federally funded health programs to take reasonable steps to provide meaningful access to individuals with limited English proficiency, and the National CLAS Standards set expectations for language assistance in health care[4]. The obligation is settled. What is not well described is the distribution of the workforce that would have to satisfy it.
I approach language-concordant availability as a structural determinant of health, on the same footing as insurance status or distance to a provider, and treat it as analytically distinct from the cultural barriers it travels with. Other cultural barriers matter as much; language is distinctive because it conditions the others. It governs which social networks a person is part of, which information reaches them, and which services are usable at all, and so it produces a structure of access with its own geography. One half of the project measures the gap: geocoding national provider directories to establish where language-concordant care is, building access measures that carry both distance and language, and estimating how state policy environments and workforce composition shape what is on offer.
The other half of the project takes on remediation, since documenting a gap does not close it. I do that work with the community organizations that see it firsthand, developing and evaluating culturally and linguistically adapted interventions and building the capacity of the people already doing the work. Partnering with community-based organizations and local government, I help design community-based solutions for improving service access among immigrants, and among immigrants with limited English proficiency in particular. This is community-engaged research: communities are partners at specific stages, including framing the question and interpreting the findings, which is a weaker claim than community-based participatory research and a more accurate one[5].
US Immigrant & Refugee Support DashboardImmigrants in Korea Dashboard
Published
Yoo, N., Park, M., & Chang, D.F. (2025). Using Computational Methods to Assess Racial, Ethnic, and Linguistic Diversity and Spatial Accessibility of the Clinical Social Work Workforce in the United States. Journal of the Society for Social Work and Research. DOI
Na, S., Solomon, P., & Yoo, N. (2026). Impact of Asian Language-Speaking Mental Health Providers on Asian American Patient Volume in Mental Health Treatment Facilities: Moderating Role of Medicaid Spending. Journal of Racial and Ethnic Health Disparities. DOI
Yoo, N., Hong, Y., & Choi, Y. (2025). Explaining Racial/Ethnic Disparities in Telehealth Use with Different Levels of English Proficiency: A Decomposition Approach. Telemedicine Reports. DOI
Baslock, D. & Yoo, N. (2026). Multidimensional Approaches to Ranking State‐Level Rurality to Enhance Comparisons Across States. The Milbank Quarterly. DOI
Yoo, N., Kang, M., Kim, E., Lee, S. Y., Woo, J., & Kim, S. Y. (2026). Korean American Church Leaders as Mental Health Gatekeepers in the USA: A Needs Assessment of Readiness, Barriers, and Referrals. Journal of Religion and Health. DOI
Yoo, N., Kang, M., Lee, S. Y., Na, J. Y., Woo, J., & Kim, S. Y. (2026). Effectiveness of a Virtual Mental Health Literacy Training for Korean American Church Leaders: Knowledge, Behavioral Intentions, and Confidence. Pastoral Psychology. DOI
Park, M., Jeong, E., Yoo, N., Choi, Y., Cabassa, L. J., Yasui, M., & Takeuchi, D. (2026). Mental health service use among Filipino American and Korean American young adults during the COVID‐19 pandemic. American Journal of Community Psychology. DOI
Under review
Yoo, N. (under review). Mental Health Facilities Withdrew Spanish-Language Services, Most in States with Restrictive Immigrant Policies: A National Panel Study, 2016-2025. Milbank Quarterly.
Yoo, N., Baslock, D., Weaver, A., & Chang, D.F. (under review). Network Structure of Linguistically and Racially/Ethnically Focused Mental Health Care Providers in Michigan. Administration and Policy in Mental Health and Mental Health Services Research.
Yoo, N., & Gill, M. (under review). Disaggregating the South Asian Category: Language-Concordant Psychotherapist Availability and Affordability in the United States. Journal of Racial and Ethnic Health Disparities.
Yoo, N., Hassan, S., & Magan, I. (under review). State Variation in Arabic-Speaking and Muslim-Affirming Mental Health Provider Supply in the US. JAMA Health Forum.
Yoo, N. (under review). Language access and written health communication: readability of Medicaid Notices of Action by primary language, 2021-2022. Patient Education and Counseling.
Yoo, N. (under review). Proof of citizenship at the point of care: documentation requests and forgone care among California immigrants, 2019-2022. Health Services Research.
Yoo, N., Kim, Y., & Moon, S. (under review). Linguistic Stratification, Mental Health, and Service Use among Refugees in South Korea: Evidence from a Multilingual Needs Assessment Survey. Health & Social Care in the Community.
Yoo, N., Choi, Y., & Hong, Y. (under review). Decomposing racial/ethnic disparities in the use of telemental health services among U.S. adolescents: Results from the National Survey. Administration and Policy in Mental Health and Mental Health Services Research.
Digital technology and AI use among immigrant and minority populations

For immigrants and minority communities, digital technology and AI carry two possibilities at once. They can lower barriers that were fixed before, reaching people across distance, cost, and sometimes language in ways an in-person system never did. They can also reproduce exclusion, when a tool is built around a default user and quietly works less well for everyone else[6]. Both are live at the same time; which one prevails in a given case is an empirical question, and the answer turns on how a tool is built and deployed and on who was kept in mind while it was.
This is also where the digital divide, first specified as differential access to devices and connections, needs a second reading[7]. Once access is roughly equal, two populations can be online in comparable numbers and still realize very different returns[8], because what a person gets back depends on what else they can reach. I study how immigrant and minority communities use e-government platforms, online communities, social media, and AI chatbots, and what they actually get back, drawing on both United States and Korean data so the same question meets two service systems that differ in how far they have digitized and in how they treat newcomers. Alongside survey work I use natural language processing on what people write in online communities, where help-seeking and distress appear in forms that surveys rarely capture[9].
Published
Yoo, N., & Jang, S.H. (2026). Who is willing to use AI mental health chatbots? Perceived impact of AI in healthcare predicts acceptance, with higher willingness among immigrants. Computers in Human Behavior Reports. DOI
Yoo, N., Lee, J., & Jang, S.H. (2026). Beyond the Digital Divide: E-Government Services and Subjective Well-Being Among North Korean Refugees and Native-born Koreans During COVID-19. Journal of Ethnic and Migration Studies. DOI
Yoo, N., Jang, S.H., Kim, D. H. & Fong, E. (2026). Analyzing Online Migration Forums: An Introduction to Natural Language Processing for International Migration Research. International Migration Review. DOI
Yoo, N., Rodwin, A., Park, M., Youm, S. & Jang, S. H. (2026). Emotional Expression and Mental Health Support in BTS Fandom Communities: A Natural Language Processing Study on YouTube Comments (Preprint). JMIR Infodemiology. DOI
Yoo, N., & Jang, S.H. (2024). Enhancing or Compensating? Role of On- and Offline Social Capital and Technological Self-Efficacy on Subjective Well-Being among Immigrants and Natives. Cyberpsychology, Behavior, and Social Networking. DOI
Yoo, N., & Jang, S.H. (2023). Digital technology use, technological self-efficacy, and subjective well-being among North Korean migrants during the COVID-19 pandemic: Moderated moderation. DIGITAL HEALTH. DOI
Under review
Yoo, N., & Jang, S.H. (under review). AI literacy and subjective well-being among immigrants and native Koreans: A multigroup analysis of a national survey. Human Behavior and Emerging Technologies.
Yoo, N., & Jang, S.H. (under review). Who Benefits More from AI Healthcare? An Adoption Funnel and Health Satisfaction Among Immigrants and Natives. AI & SOCIETY.
Yoo, N., & Jang, S.H. (under review). Did Generative AI Narrow the Digital Divide for Immigrants in South Korea? A Difference-in-Differences Study, 2019-2023. Telematics and Informatics.
Yoo, N., Lee, J., Chow, C., & Cureton, A. (under review). Peer Support and Digital Mutual Aid among DACA Recipients Under Liminal Legality: A Computational Text Analysis of Reddit Community. Journal of Computational Social Science.
Yoo, N., & Chen, P. (under review). The AI Therapist: ChatGPT Therapy Users at the Boundary of Human Therapy, Disillusionment, and AI Companionship on Reddit. EMNLP Workshop on NLP for Positive Impact.
Yoo, N., & Jang, S.H. (under review). Connected but Burdened: Broadband Affordability and Subjective Well-Being among North Korean Migrants and South Korean Natives. Information, Communication & Society.
AI literacy among practitioners

Practitioners are increasingly expected to work alongside AI in assessment, documentation, and decision-making[10], and that expectation is arriving ahead of the training that would let them use these tools well. Practitioners who serve immigrant and minority communities carry an added weight, because a tool that works less well for those communities does its harm precisely where the stakes are already high. Most available ethics guidance assumes an organization with the resources to interpret and apply it[11], which does not describe many of the community settings where this work happens.
My own position is that AI is most usefully treated as a normal technology, in the sense Arvind Narayanan and Sayash Kapoor give the term in AI as Normal Technology[12]: its effects arrive through decades of diffusion into institutions, and what decides who benefits is adoption, access, and governance more than the model itself. I teach this view in my technology course (SIL 503, Week 3). Holding it also means working closely with technologists and computational scientists, since judging what a tool does depends on understanding how it is built.
This project develops and evaluates training for practitioners and studies the gap that guidance leaves. The competency at issue is judgment: recognizing what a given tool can and cannot do, which way it tends to fail, and which failure would cost a client more. It spans continuing education, computational training for social work researchers, and analysis of how AI ethics guidance holds up in resource-constrained settings.
Published
Yoo, N., Khor, A., Mukhija, N., Adebiyi, A., & Zilka, M. (2026). Guidelines for Whom? Rethinking AI Ethics in Resource-Constrained Migration Services. Proceedings of the Workshop on Evaluating Evaluations (EvalEval). DOI
Yoo, N., Saba, S., & Goldkind, L. (in press). Teaching Note—Advancing AI Literacy in Continuing Education for Social Workers: Lessons from a Post-Master Certificate Program on AI and Mental Health. Journal of Social Work Education.
Stanhope, V., Yoo, N., Matthews, L., Baslock, D., & Hu, Y. (2024). The Impact of Collaborative Documentation on Person-Centered Care: Textual Analysis of Clinical Notes. JMIR Medical Informatics. DOI
Yoo, N., Matthews, L., Baslock, D. & Stanhope, V. (2024). Impact of Collaborative Documentation on Completeness and Length of Clinical Notes in Behavioral Health Settings. Psychiatric Services. DOI
Under review
Yoo, N., & Kim, Y. (under review). Agentic LLM to Improve Information Access for Refugees: A Field Report from a Resource-Constrained Organization. EMNLP Workshop on NLP for Positive Impact.
Yoo, N., Stanhope, V., Matthews, L., Hu, Y., & Fang, Y. (revised and resubmitted). Who Writes Better Notes? Linguistic Comparison Between Human-Written and AI-Generated Clinical Notes. Journal of Technology in Human Services.
Computational social science methods for social work

Social work has always relied on data, but the questions it cares about have outrun the methods it conventionally uses. Whole populations leave traces in provider directories, administrative records, and public text, and reaching them calls for tools that social work training rarely covers: natural language processing, machine learning, geospatial analysis, and the collection of large digital datasets[13][14]. Running through my projects is a methodological thread that develops and adapts these tools for social work questions, and asks what changes when the profession takes them up.
The interest is as much pedagogical and critical as it is technical. I train the next generation of computational social work scientists and work to lower the barrier to entry for methods that can look forbidding from the outside, which means teaching reproducible workflows and honest validation as much as the techniques themselves. I am also attentive to what these methods carry in with them: what they quietly measure, whose data they are built from, and which assumptions about people and social life they bring along from the fields that produced them. Naming those assumptions and designing around them is part of the method itself.
Published
Yoo, N., Park, M., & Chang, D.F. (2025). Using Computational Methods to Assess Racial, Ethnic, and Linguistic Diversity and Spatial Accessibility of the Clinical Social Work Workforce in the United States. Journal of the Society for Social Work and Research. DOI
Yoo, N., Jang, S.H., Kim, D. H. & Fong, E. (2026). Analyzing Online Migration Forums: An Introduction to Natural Language Processing for International Migration Research. International Migration Review. DOI
Yoo, N., Ritchie, A., & Gwadz, M. (in press). Training Computational Social Work Scientists: Lessons from Summer Institute of Computational Social Science. Journal of Social Work Education.
Under review
Yoo, N., Hong, S., Ahn, E., Kane, J., & Grogan-Kaylor, A. (under review). Individual Turn? Examining Ecological Perspectives in Machine Learning Applications in Social Work Research. Journal of the Society for Social Work and Research.
1. Zong, J., & Batalova, J. (2015). The limited English proficient population in the United States. Migration Policy Institute.
2. World Health Organization. (2023). Refugee and migrant mental health [Fact sheet].
3. Mohammadifirouzeh, M., Oh, K. M., Basnyat, I., & Gimm, G. (2023). Factors associated with professional mental help-seeking among U.S. immigrants: A systematic review. Journal of Immigrant and Minority Health, 25(2), 1–19. DOI
4. HHS Office of Minority Health. (2013). National standards for culturally and linguistically appropriate services (CLAS) in health and health care. Federal Register.
5. Ward, M., Schulz, A. J., Israel, B. A., Rice, K., Martenies, S. E., & Markarian, E. (2018). A conceptual framework for evaluating health equity promotion within community-based participatory research partnerships. Evaluation and Program Planning, 70, 25–34. DOI
6. Benjamin, R. (2019). Race after technology: Abolitionist tools for the new Jim Code. Polity Press.
7. DiMaggio, P., & Hargittai, E. (2001). From the “digital divide” to “digital inequality”: Studying Internet use as penetration increases (Working Paper No. 15). Center for Arts and Cultural Policy Studies, Princeton University. LINK
8. van Deursen, A. J. A. M., & van Dijk, J. A. G. M. (2014). The digital divide shifts to differences in usage. New Media & Society, 16(3), 507–526. DOI
9. Malgaroli, M., Hull, T. D., Zech, J. M., & Althoff, T. (2023). Natural language processing for mental health interventions: A systematic review and research framework. Translational Psychiatry, 13, 309. DOI
10. National Association of Social Workers, Association of Social Work Boards, Council on Social Work Education, & Clinical Social Work Association. (2017). Standards for technology in social work practice. NASW Press.
11. Jobin, A., Ienca, M., & Vayena, E. (2019). The global landscape of AI ethics guidelines. Nature Machine Intelligence, 1(9), 389–399. DOI
12. Narayanan, A., & Kapoor, S. (2025). AI as normal technology. Knight First Amendment Institute at Columbia University. LINK
13. Lazer, D., Pentland, A., Adamic, L., Aral, S., Barabási, A.-L., Brewer, D., Christakis, N., Contractor, N., Fowler, J., Gutmann, M., Jebara, T., King, G., Macy, M., Roy, D., & Van Alstyne, M. (2009). Computational social science. Science, 323(5915), 721–723. DOI
14. Salganik, M. J. (2018). Bit by bit: Social research in the digital age. Princeton University Press.