Koga HK, McNamara T, Kelly EL, Kubzansky LD, Berkman LF. Work Unit Conditions and Emotional Exhaustion: A Multi-level Study of Healthcare Workers. Accepted at the Journal of Occupational and Environmental Medicine.

Chen Y, Kubzansky LD, Kim ES, Koga HK, et al. The Distribution of Optimism Across Sociodemographic Groups in 22 Countries. Scientific Reports. 2025;15(1):14553.

Chen Y, Kubzansky LD, Kim ES, Koga HK, et al. When the Glass is Half Full: Early Life Experiences and Adult Optimism in 22 Countries. npj Mental Health Research. 2025;4(1):1-10.

VanderWeele TJ, Johnson BR, Bialowolski PT…Koga HK, et al. The Global Flourishing Study:　Study Profile and Initial Results on Flourishing. Nature Mental Health 3, 636-653 (2025).

Koga HK, Grodstein F, Williams DR, et al. Longitudinal Associations Between Optimism and Objective Measures of Physical Functioning in Women. JAMA Psychiatry. 2024;81(5):489. doi:10.1001/jamapsychiatry.2023.5068

Koga HK, Manson JE, Kubzansky LD. Limitations for Assessing Optimism and Physical Functioning in Women—Reply. JAMA Psychiatry. 2024;81(9):947-948. doi:10.1001/jamapsychiatry.2024.2031

Koga HK, Grodstein F, Williams DR, Buchman AS, Kubzansky LD. Purpose in Life and Its Association to Parkinsonism. The Journals of Gerontology: Series B. 2024;79(5):gbae026. doi:10.1093/geronb/gbae026

Koga HK, Grodstein F, Williams DR, Demeo DL, Kubzansky LD. Relations of optimism and purpose in life to immune markers in aging. Journal of Psychosomatic Research. 2024;184:111851. doi:10.1016/j.jpsychores.2024.111851

Berkman LF, Kelly EL, Hammer LB, Mierzwa F, Bodner T, McNamara T, Koga HK et al. Employee Cardiometabolic Risk Following a Cluster-Randomized Workplace Intervention From the Work, Family and Health Network, 2009–2013. Am J Public Health. 2023;113(12):1322-1331. doi:10.2105/AJPH.2023.307413

Trudel-Fitzgerald C, Lee LO, Guimond AJ, Chen R, James P, Koga HK et al. A long and resilient life: the role of coping strategies and variability in their use in lifespan among women. Anxiety, Stress, & Coping. 2023;0(0):1-14. doi:10.1080/10615806.2023.2288333

Case B, Counted V, Ritchie-Dunham J, Cowden R, Gibson C, Koga HK, Lomas T, Padgett N. Beyond a single story: The heterogeneity of human flourishing in 22 countries. International Journal of Wellbeing. 2023;13(4). doi:10.5502/ijw.v13i4.3555

Lee HH, Okuzono SS, Trudel-Fitzgerald C, James P, Koga HK et al. Social integration and risk of mortality among African-Americans: the Jackson heart study. Soc Psychiatry Psychiatr Epidemiol. 2023;58(9):1317-1327. doi:10.1007/s00127-023-02485-1

Koga HK, Trudel-Fitzgerald C, Lee LO, et al. Optimism, lifestyle, and longevity in a racially diverse cohort of women. Journal of the American Geriatrics Society. 2022;70(10):2793-2804. doi:10.1111/jgs.17897

James P, Trudel-Fitzgerald C, Lee HH, Koga HK, Kubzansky LD, Grodstein F. Linking Individual-Level Facebook Posts With Psychological and Health Data in an Epidemiological Cohort: Feasibility Study. JMIR Form Res. 2022;6(4):e32423. doi:10.2196/32423

Lee HH, Kubzansky LD, Okuzono SS, Trudel-Fitzgerald C, James P, Koga HK, Kim ES, Glover LM, Sims M, Grodstein F. Optimism and risk of mortality among African-Americans: The Jackson heart study. Preventive Medicine. 2022;154:106899. doi:10.1016/j.ypmed.2021.106899

Lee LO, Grodstein F, Trudel-Fitzgerald C, James P, Okuzono SS, Koga HK, Schwartz J, Spiro A, Mroczek DK, Kubzansky LD. Optimism, Daily Stressors, and Emotional Well-Being Over Two Decades in a Cohort of Aging Men. The Journals of Gerontology: Series B. Published online March 7, 2022:gbac025. doi:10.1093/geronb/gbac025

Okuzono SS, Shiba K, Lee HH, Shirai K, Koga HK, Kondo N, Fujiwara T, Kondo K, Grodstein F, Kubzansky LD, Trudel-Fitzgerald C. Optimism and Longevity Among Japanese Older Adults. J Happiness Stud. Published online March 11, 2022. doi:10.1007/s10902-022-00511-8

Osawa I, Goto T, Tabuchi T, Koga HK, Tsugawa Y. Machine-learning approaches to identify determining factors of happiness during the COVID-19 pandemic: retrospective cohort study. BMJ Open. 2022;12(12):e054862. doi:10.1136/bmjopen-2021-054862

Kubzansky LD, Boehm JK, Allen AR, Vie LL, Ho TE, Trudel-Fitzgerald C, Koga HK, Scheier LM, Seligman MEP. Optimism and risk of incident hypertension: a target for primordial prevention. Epidemiol Psychiatr Sci. 2020 Aug 14;29:e157. doi: 10.1017/S2045796020000621. PMID: 32792035; PMCID: PMC7443774.

Eguchi H, Kachi Y, Koga HK, Sakka M, Tokita M, Shimazu A. Validation of the Japanese Version of the Multidimensional Measure of Family Supportive Supervisor Behaviors (FSSB-J).  Front Psychol. 2019 Nov 22;10:2628. doi: 10.3389/fpsyg.2019.02628. eCollection 2019.

Boehm JK, Chen Y, Koga HK, Mathur MB, Vie LL, Kubzansky LD. Is Optimism Associated With Healthier Cardiovascular-Related Behavior? Meta-Analyses of 3 Health Behaviors. Circ Res. 2018 Apr 13;122(8):1119-1134. doi: 10.1161/CIRCRESAHA.117.310828. Review. PMID: 29650630

Kubzansky LD, Huffman JC, Boehm JK, Hernandez R, Kim ES, Koga HK, Feig EH, Lloyd-Jones DM, Seligman MEP, Labarthe DR. Positive Psychological Well-Being and Cardiovascular Disease: JACC Health Promotion Series. J Am Coll Cardiol. 2018 Sep 18;72(12):1382-1396. doi: 10.1016/j.jacc.2018.07.042. Review. PMID: 30213332