Zach Gassoumis, PhD

Title(s)Assistant Professor of Research Family Medicine
SchoolKeck School of Medicine of Usc
Address1000 S. Fremont Ave, Unit 22
Off Campus
Alhambra CA 91803
Phone+1 626 457 6692
ORCID ORCID Icon0000-0002-0005-9454 Additional info
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    Collapse Biography 
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    University of Durham, Durham, UKBSc06/2004Psychology & Anthropology
    University of Southern California, Los Angeles, CAPhD05/2014Gerontology

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    Collapse Overview
    Zach Gassoumis, PhD, is an Assistant Professor of Family Medicine and Gerontology at the Keck School of Medicine of USC. He conducts research into various aspects of quality of life for older adults, with a primary focus on elder abuse, caregiving, and health & social services. His research focuses on improving the wellbeing of vulnerable populations and racial/ethnic minority groups, particularly his early work on economic security.

    Zach’s most recent research projects investigate service provision by adult protective services (APS), mandated reporting of elder abuse to APS, elder abuse in people with dementia, elder abuse multidisciplinary team (MDT) models, and caregiver support interventions. He holds a fellowship through the Robert Wood Johnson Foundation’s Interdisciplinary Research Leaders program and has affiliations with the National Center on Elder Abuse, National APS Technical Assistance Research Center, and National Elder Abuse MDT Training and Technical Assistance Center.

    Collapse Research 
    Collapse Research Activities and Funding
    Automating Client Referrals to a Multidisciplinary Team: Development, Implementation, & Impact Assessment
    Administration for Community Living 90EJIG0040Sep 1, 2022 - Aug 30, 2024
    Role: PI
    Description: Creating and testing an algorithm that identifies adult protective services cases that are good candidates for presentation at and intervention by a multidisciplinary team, in partnership with San Francisco Adult Protective Services.
    Interdisciplinary Research Leaders Program
    Robert Wood Johnson Foundation Sep 15, 2019 - Sep 14, 2022
    Role: Fellow
    Description: The goal of this fellowship is to develop the fellows’ skills in conducting community-based participatory research, while also supporting a research project. The research project assesses perspectives, experiences, and barriers surrounding the mandated reporting of elder abuse by home health workers in Maine and implements and evaluates a warmline for mandated reporters to discuss possible cases of abuse. Project Title: Making the Mandate Work: Reducing Disparities by Identifying and Overcoming Barriers to Reporting Elder Abuse to Adult Protective Services (with Stuart Lewis & Patricia Kimball).
    Uncovering the Causes, Contexts, and Consequences of Elder Mistreatment in People with Dementia
    NIH R01AG060096Aug 15, 2018 - Mar 31, 2023
    Role: Multi-PI (with Laura Mosqueda)
    Description: This project uses longitudinal observation, mixed method interviewing, and electronic health records to better understand how elder mistreatment is experienced in people living with dementia, and how care partner characteristics are related to the experience of mistreatment.

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    Collapse Publications
    Publications listed below are automatically derived from MEDLINE/PubMed and other sources, which might result in incorrect or missing publications. Researchers can login to make corrections and additions, or contact us for help. to make corrections and additions.
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    Altmetrics Details PMC Citations indicate the number of times the publication was cited by articles in PubMed Central, and the Altmetric score represents citations in news articles and social media. (Note that publications are often cited in additional ways that are not shown here.) Fields are based on how the National Library of Medicine (NLM) classifies the publication's journal and might not represent the specific topic of the publication. Translation tags are based on the publication type and the MeSH terms NLM assigns to the publication. Some publications (especially newer ones and publications not in PubMed) might not yet be assigned Field or Translation tags.) Click a Field or Translation tag to filter the publications.
    1. Healthcare costs for legally adjudicated elder mistreatment victims in comparison to non-mistreated older adults. J Am Geriatr Soc. 2024 01; 72(1):236-245. Zhang H, Bao Y, Baek D, Clark S, Elman A, Hancock D, Chang ES, Jeng P, Gassoumis Z, Fettig N, Zhang Y, Wen K, Lachs MS, Pillemer K, Rosen T. PMID: 38112382; PMCID: PMC10872321.
      View in: PubMed   Mentions:    Fields:    Translation:Humans
    2. The Mediating Role of Sense of Control in the Associations Between Remote Contacts and Loneliness Among Older Adults. Res Aging. 2024 Feb; 46(2):167-175. Yoon D, Gallo H, Gassoumis ZD, Joo S. PMID: 37861368.
      View in: PubMed   Mentions:    Fields:    Translation:Humans
    3. Comprehensive Older Adult and Caregiver Help (COACH): A person-centered caregiver intervention prevents elder mistreatment. J Am Geriatr Soc. 2024 01; 72(1):246-257. Gassoumis ZD, Martinez JM, Yonashiro-Cho J, Mosqueda L, Hou A, Han SD, Olsen B, Louis A, Connolly MT, Meyer K, Marnfeldt K, Salinas Navarro SA, Yan M, Wilber KH. PMID: 37791406; PMCID: PMC10842324.
      View in: PubMed   Mentions:    Fields:    Translation:Humans
    4. Emergency Department and Hospital Utilization Among Older Adults Before and After Identification of Elder Mistreatment. JAMA Netw Open. 2023 02 01; 6(2):e2255853. Rosen T, Zhang H, Wen K, Clark S, Elman A, Jeng P, Baek D, Zhang Y, Gassoumis Z, Fettig N, Pillemer K, Lachs MS, Bao Y. PMID: 36787139; PMCID: PMC9929702.
      View in: PubMed   Mentions: 1     Fields:    Translation:Humans
    5. Adult Maltreatment Risk Factors: Adding Community-Level Factors to an Individual-Level Field. Trauma Violence Abuse. 2024 01; 25(1):5-21. Fettig N, Mitchell H, Gassoumis Z, Nizam Z, Whittier Eliason S, Cory S. PMID: 36636944.
      View in: PubMed   Mentions:    Fields:    Translation:Humans
    6. A comparison of negative financial events experienced by carers and non-carers following onset of the Great Recession. Int J Care Caring. 2021 Nov; 5(4):557-570. Meyer K, Gassoumis Z, Wilber K. PMID: 34869911; PMCID: PMC8635292.
      View in: PubMed   Mentions: 1  
    7. Improving forensics: Characterizing injuries among community-dwelling physically abused older adults. J Am Geriatr Soc. 2021 08; 69(8):2252-2261. Yonashiro-Cho JMF, Gassoumis ZD, Wilber KH, Homeier DC. PMID: 33945150.
      View in: PubMed   Mentions:    Fields:    Translation:Humans
    8. Anticipated Need for Future Nursing Home Placement by Sexual Orientation: Early Findings from the Health and Retirement Study. Sex Res Social Policy. 2021. Singleton M, Gassoumis ZD, Enguidanos S. View Publication.
    9. The Differential Effects of Caregiving Intensity on Overnight Hospitalization. West J Nurs Res. 2022 06; 44(6):528-539. Meyer K, Gassoumis Z, Wilber K. PMID: 33764207; PMCID: PMC8463626.
      View in: PubMed   Mentions: 2     Fields:    Translation:Humans
    10. Who is in the revolving door? Policy and practice implications of recurrent reports to adult protective services. J Elder Abuse Negl. 2020 Nov-Dec; 32(5):489-508. Rowan JM, Yonashiro-Cho J, Wilber KH, Gassoumis ZD. PMID: 33308080.
      View in: PubMed   Mentions: 2     Fields:    Translation:Humans
    11. Toward a better understanding of the elder abuse forensic center model: comparing and contrasting four programs in California. J Elder Abuse Negl. 2019 Aug-Dec; 31(4-5):402-423. Yonashiro-Cho J, Rowan JM, Gassoumis ZD, Gironda MW, Wilber KH. PMID: 31423950.
      View in: PubMed   Mentions:    Fields:    Translation:Humans
    12. Elder Abuse Characteristics Based on Calls to the National Center on Elder Abuse Resource Line. J Appl Gerontol. 2020 10; 39(10):1078-1087. Weissberger GH, Goodman MC, Mosqueda L, Schoen J, Nguyen AL, Wilber KH, Gassoumis ZD, Nguyen CP, Han SD. PMID: 31364442; PMCID: PMC6992470.
      View in: PubMed   Mentions: 9     Fields:    Translation:Humans
    13. What Can Elder Mistreatment Researchers Learn About Primary Prevention From Family Violence Intervention Models? Gerontologist. 2019 07 16; 59(4):601-609. Meyer K, Yonashiro-Cho J, Gassoumis ZD, Mosqueda L, Han SD, Wilber KH. PMID: 29190372.
      View in: PubMed   Mentions: 1     Fields:    Translation:HumansPHPublic Health
    14. What Are the Characteristics of Caregivers Logging in for Support Services? Innov Aging. 2019 Jan; 3(1):igz006. Meyer K, Gassoumis ZD, Kelly K, Benton D. PMID: 30949590; PMCID: PMC6441129.
      View in: PubMed   Mentions: 3  
    15. Using Latent Class Analysis to Identify Profiles of Elder Abuse Perpetrators. J Gerontol B Psychol Sci Soc Sci. 2018 06 14; 73(5):e49-e58. DeLiema M, Yonashiro-Cho J, Gassoumis ZD, Yon Y, Conrad KJ. PMID: 28329841; PMCID: PMC6283306.
      View in: PubMed   Mentions: 8     Fields:    
    16. What Are Strategies to Advance Policies Supporting Family Caregivers? Promising Approaches From a Statewide Task Force. J Aging Soc Policy. 2018 Jun 08; 1-19. Meyer K, Rath L, Gassoumis Z, Kaiser N, Wilber K. PMID: 29883273.
      View in: PubMed   Mentions: 2     Fields:    
    17. Research Protocol for Systematic Review and Meta-Analysis of Elder Abuse Prevalence Studies. Can J Aging. 2017 06; 36(2):256-265. Yon Y, Mikton C, Gassoumis ZD, Wilber KH. PMID: 28399951.
      View in: PubMed   Mentions: 2     Fields:    Translation:Humans
    18. The Prevalence of Self-Reported Elder Abuse Among Older Women in Community Settings: A Systematic Review and Meta-Analysis. Trauma Violence Abuse. 2019 04; 20(2):245-259. Yon Y, Mikton C, Gassoumis ZD, Wilber KH. PMID: 29333977.
      View in: PubMed   Mentions: 15     Fields:    Translation:Humans
    19. Elder abuse prevalence in community settings: a systematic review and meta-analysis. Lancet Glob Health. 2017 02; 5(2):e147-e156. Yon Y, Mikton CR, Gassoumis ZD, Wilber KH. PMID: 28104184.
      View in: PubMed   Mentions: 133     Fields:    Translation:Humans
    20. Community Discharge of Nursing Home Residents: The Role of Facility Characteristics. Health Serv Res. 2016 Apr; 51(2):645-66. Holup AA, Gassoumis ZD, Wilber KH, Hyer K. PMID: 26211390; PMCID: PMC4799895.
      View in: PubMed   Mentions: 13     Fields:    Translation:Humans
    21. Nursing Home Residents' Preferences on Physician Orders for Life Sustaining Treatment. Gerontologist. 2016 08; 56(4):714-22. Rahman AN, Bressette M, Gassoumis ZD, Enguidanos S. PMID: 26035903; PMCID: PMC4944535.
      View in: PubMed   Mentions: 7     Fields:    Translation:Humans
    22. Protecting victims of elder financial exploitation: the role of an Elder Abuse Forensic Center in referring victims for conservatorship. Aging Ment Health. 2015; 19(9):790-8. Gassoumis ZD, Navarro AE, Wilber KH. PMID: 25269384.
      View in: PubMed   Mentions: 9     Fields:    Translation:Humans
    23. Who transitions to the community from nursing homes? Comparing patterns and predictors for short-stay and long-stay residents. Home Health Care Serv Q. 2013; 32(2):75-91. Gassoumis ZD, Fike KT, Rahman AN, Enguidanos SM, Wilber KH. PMID: 23679659; PMCID: PMC3711511.
      View in: PubMed   Mentions: 20     Fields:    Translation:Humans
    24. Determining prevalence and correlates of elder abuse using promotores: low-income immigrant Latinos report high rates of abuse and neglect. J Am Geriatr Soc. 2012 Jul; 60(7):1333-9. DeLiema M, Gassoumis ZD, Homeier DC, Wilber KH. PMID: 22697790; PMCID: PMC3396729.
      View in: PubMed   Mentions: 24     Fields:    Translation:Humans
    25. Holding abusers accountable: an elder abuse forensic center increases criminal prosecution of financial exploitation. Gerontologist. 2013 Apr; 53(2):303-12. Navarro AE, Gassoumis ZD, Wilber KH. PMID: 22589024.
      View in: PubMed   Mentions: 18     Fields:    Translation:Humans
    26. Conversion diversion: participation in a social HMO reduces the likelihood of converting from short-stay to long-stay nursing facility placement. J Am Med Dir Assoc. 2010 Jun; 11(5):333-7. Thomas KE, Gassoumis ZD, Wilber KH. PMID: 20511100; PMCID: PMC2879400.
      View in: PubMed   Mentions: 5     Fields:    Translation:Humans
    27. Who are the Latino baby boomers? Demographic and economic characteristics of a hidden population. J Aging Soc Policy. 2010 Jan; 22(1):53-68. Gassoumis ZD, Wilber KH, Baker LA, Torres-Gil FM. PMID: 20390712.
      View in: PubMed   Mentions: 12     Fields:    Translation:HumansPHPublic Health
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