Zach Gassoumis

Assistant Professor of Research Family Medicine & Gerontology

University of Southern California
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About

Dr. Zach Gassoumis is an Assistant Professor of Research in Family Medicine and Gerontology at the University of Southern California. His research focuses on issues related to elder mistreatment, caregiver interventions, and the well-being of older adults. Recent articles explore topics such as the acceptability of interventions to prevent elder mistreatment and the impact of caregiving intensity on health outcomes. He is dedicated to advancing understanding in gerontology and promoting effective support for aging populations.

Articles (6)

Year:

2025

Year:

2024

Year:

2024

This study explored whether a sense of control over social life mediated the associations between using remote contact (phone calls, letters/emails, social media) and loneliness for socially isolated older adults. We used path analysis with the 2014 and 2016 Health and Retirement Study datasets ( N = 3767). Results showed that more frequent phone calls and letters/emails were associated with lower levels of loneliness through sense of control. However, sense of control did not mediate the association between social media and loneliness. Findings suggest that promoting sense of control over social life by remote contact, particularly phone calls and letters/emails, may be effective in alleviating loneliness for isolated older adults.

Year:

2023

Background Elder mistreatment (EM) harms individuals, families, communities, and society as a whole. Yet research on interventions is lagging, and no rigorous studies demonstrating effective prevention have been published. This pilot study examines whether a first‐of‐its‐kind coaching intervention reduced the experience of EM among older adults with chronic health conditions, including dementia. Methods We used a double‐blind, randomized controlled trial to test a strengths‐based person‐centered caregiver support intervention, developed from evidence‐based approaches used in other types of family violence. Participants ( n = 80), family caregivers of older adults who were members of Kaiser Permanente, completed surveys at baseline, post‐test, and 3‐month follow‐up. The primary outcome was caregiver‐reported EM; additional proximal outcomes were caregiver burden, quality‐of‐life, anxiety, and depression. Nonparametric tests (Mann–Whitney U , Fisher's Exact, Wilcoxon Signed Rank, and McNemar's) were used to make comparisons between treatment and control groups and across time points. Results The treatment group had no EM after intervention completion (assessed at 3‐month follow‐up), a significantly lower rate than the control group (treatment = 0%, control = 23.1%, p = 0.010). Conclusions In this pilot study, we found that the COACH caregiver support intervention successfully reduced EM of persons living with chronic illness, including dementia. Next steps will include: (1) testing the intervention's mechanism in a fully powered RCT and (2) scaling the intervention for testing in a variety of care delivery systems.

Year:

2023

Year:

2022

Collaborators (8)

Wenxing Wei

Case Western Reserve University

UNITED STATES
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Mengzhao Yan

University of Southern California

UNITED STATES
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Kathleen H. Wilber

-

UNITED STATES
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Hao Zhang

Assistant Professor

The University of Alabama

UNITED STATES
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Christopher Burant

Ass0ciate Professor

Case Western Reserve University

UNITED STATES
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Susanna Joo

Yonsei University

SOUTH KOREA
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Kylie Meyer

Assistant Professor

Case Western Reserve University

UNITED STATES
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Duke Han

Professor

University of Southern California

UNITED STATES
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