Research Areas

• Controlled human exposure health effects studies, incorporating chemical exposures and psychological stress to model realistic environmental exposures.
• Epidemiologic investigations of toxic encephalopathy among workers chronically exposed to solvents and lead with a focus on integrating neuropsychological testing, exposure assessment, and functional imaging.
• Translational research to examine whether alteration in HPA axis function among lead exposed animals translates to humans chronically exposed to lead
• International studies based in Thailand to investigate the cognitive and behavioral effects of pesticide exposure in a birth cohort

Research Highlights

• Discovered a negative dose response relationship between lifetime solvent exposure and functional imaging activation patterns during performance of a working memory task.
• Demonstrated neurobehavioral performance deficits among workers chronically exposed to solvents
• Validated a lifetime solvent exposure index with neurobehavioral performance among workers chronically exposed to solvent mixtures
• Current blood and bone lead alters hypothalamic pituitary adrenal axis function among workers with lifetime exposure
• Developing behavioral research capacity among public health students at Chulalongkorn University, Bangkok, Thailand.

Scholarly Activities

• Member of the Joint Graduate Program in Toxicology, Rutgers University
• NIH Fogarty International Center Grant reviewer
• Co-Chair for the New Jersey Alliance for Clinical and Translational Science Scientific Review Board
• New Jersey Kids Study Co-Chair for neurodevelopmental assessment
• EOHSI representative for the RBHS Mentor Committee
• Chair for the EOHSI Faculty Search Committee

Recent Publications

Click here for additiional publications by Dr. Fiedler.

1. Sullivan, MW, Nimmapirat, P, Fiedler, N. A framework for infants’ emerging affect-cognition interface. Curr Psychol. 2026;45 (14):1214. doi: 10.1007/s12144-026-09271-7. PubMed PMID:42459355 PubMed Central PMC13369582
2. Nimmapirat, P, Suttiwan, P, Promduang, W, Sittiwang, S, Prapamontol, T, Naksen, W, Panuwet, P, Barr, DB, Ohman-Strickland, P, Fiedler, N et al.. The Quality of the Home Environment During the First 2 Years of Life and Cognitive Development in Early Childhood: A Study of Thai Agricultural Families. Child Care Health Dev. 2026;52 (2):e70245. doi: 10.1111/cch.70245. PubMed PMID:41704051
3. Marvi, K, Sikder, IU, Wang, S, Espinoza, J, Fiedler, N, Pavlova, J, Holovanova, I, Barrett, ES, Haque, U. Machine learning reveals drivers of cold-related illness during energy infrastructure attacks in Wartime Ukraine. Sci Rep. 2025;16 (1):2555. doi: 10.1038/s41598-025-32344-9. PubMed PMID:41476120 PubMed Central PMC12820090
4. Wang, Y, Holstein, J, Hermetz, K, Burt, A, Lesseur, C, Panuwet, P, Fiedler, N, Prapamontol, T, Suttiwan, P, Nimmapirat, P et al.. Prenatal pyrethroid exposure, placental gene network modules, and neonatal neurobehavior. Int J Hyg Environ Health. 2025;269 :114646. doi: 10.1016/j.ijheh.2025.114646. PubMed PMID:40789244 PubMed Central PMC12392096
5. Marvi, K, Sikder, IU, Wang, S, Espinoza, J, Fiedler, N, Pavlova, J, Holovanova, I, Barrett, ES, Haque, U. Winter’s Toll: Assessing the Public Health Impact of Cold-Related Illnesses and Energy Damage in Ukraine During the Invasion. Res Sq. 2025; :. doi: 10.21203/rs.3.rs-6589736/v1. PubMed PMID:40502762 PubMed Central PMC12155211
6. Naeem, A, Sikder, I, Wang, S, Barrett, ES, Fiedler, N, Ahmad, M, Nguyen, UDT, Martsenkovskyi, D, Holovanova, I, Hicks, MH et al.. Parent-child mental health in Ukraine in relation to war trauma and drone attacks. Compr Psychiatry. 2025;139 :152590. doi: 10.1016/j.comppsych.2025.152590. PubMed PMID:40090214
7. Fiedler, N, Nimmapirat, P, Sullivan, MW, Promduang, W, Chaikittipornlert, N, Prapamontol, T, Naksen, W, Panuwet, P, Barr, DB, Baumert, BO et al.. A birth cohort observational study to assess the association of prenatal biomarkers of organophosphates with visual attention, recognition memory and information processing among Thai infants. Environ Res. 2025;274 :121197. doi: 10.1016/j.envres.2025.121197. PubMed PMID:40024501 PubMed Central PMC12707512
8. Wang, Y, Hermetz, K, Burt, A, Lesseur, C, Panuwet, P, Fiedler, N, Prapamontol, T, Suttiwan, P, Nimmapirat, P, Sittiwang, S et al.. Prenatal exposure to pesticide mixtures and the placental transcriptome: Insights from trimester-specific, sex-specific and metabolite-scaled analyses in the SAWASDEE cohort. Environ Res. 2025;267 :120637. doi: 10.1016/j.envres.2024.120637. PubMed PMID:39675449 PubMed Central PMC11794011
9. Eick, SM, Sehgal, N, Salamova, A, Fiedler, N, Hood, RB, Yakimavets, V, Promkam, N, Prapamontol, T, Suttiwan, P, Sittiwang, S et al.. Per- and polyfluoroalkyl substances in paired serum and breastmilk samples among pregnant farmworkers in Thailand. Int J Hyg Environ Health. 2025;264 :114509. doi: 10.1016/j.ijheh.2024.114509. PubMed PMID:39647432 PubMed Central PMC11788031
10. Gigliotti, RA, Weidner, M, Jansen, M, Greenberg, P, Bachmann, G, Dominguez-Bello, MG, Parmar, V, Panettieri, RA Jr, Reilly, N, Ayers, CA et al.. Assessments of working group effectiveness in the planning of the New Jersey Kids Study: An applied mixed-methods study on the science of team science. J Clin Transl Sci. 2024;8 (1):e163. doi: 10.1017/cts.2024.578. PubMed PMID:39619065 PubMed Central PMC11604504