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. 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
2. 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
3. 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
4. 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
5. 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
6. 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
7. 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
8. 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
9. 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
10. Lu, FT, Gupta, D, Fiedler, N, Satish, U, Black, KG, Legard, A, De Resende, A, Guo, C, Gow, AJ, Kipen, HM et al.. Mechanisms Underlying Acute Cognitive Impairment following Carbon Dioxide Inhalation in a Randomized Crossover Trial. Environ Health Perspect. 2024;132 (10):107702. doi: 10.1289/EHP14806. PubMed PMID:39466336 PubMed Central PMC11515854