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. Wang, S, Barrett, E, Hicks, MH, Martsenkovskyi, D, Holovanova, I, Marchak, O, Ishchenko, L, Haque, U, Fiedler, N. Associations between mental health symptoms, trauma, quality of life and coping in adults living in Ukraine: A cross-sectional study a year after the 2022 Russian invasion. Psychiatry Res. 2024;339 :116056. doi: 10.1016/j.psychres.2024.116056. PubMed PMID:38968918
2. Haque, U, Bukhari, MH, Fiedler, N, Wang, S, Korzh, O, Espinoza, J, Ahmad, M, Holovanova, I, Chumachenko, T, Marchak, O et al.. A Comparison of Ukrainian Hospital Services and Functions Before and During the Russia-Ukraine War. JAMA Health Forum. 2024;5 (5):e240901. doi: 10.1001/jamahealthforum.2024.0901. PubMed PMID:38758566 PubMed Central PMC11102023
3. Wang, Y, Hermetz, K, Burt, A, Kennedy, EM, Lesseur, C, Panuwet, P, Fiedler, N, Prapamontol, T, Suttiwan, P, Naksen, W et al.. Placental transcriptome variation associated with season, location, and urinary prenatal pyrethroid metabolites of Thai farm-working women. Environ Pollut. 2024;349 :123873. doi: 10.1016/j.envpol.2024.123873. PubMed PMID:38554839 PubMed Central PMC11070292
4. Dang, T, Sehgal, N, Barr, DB, Panuwet, P, Liang, D, Smarr, M, Naksen, W, Fiedler, N, Promkam, N, Prapamontol, T et al.. Association of prenatal chlorpyrifos exposure with sexually dimorphic differences in anogenital distance among Thai farmworker children. Environ Res. 2024;248 :118325. doi: 10.1016/j.envres.2024.118325. PubMed PMID:38286251 PubMed Central PMC11023773
5. Nimmapirat, P, Fiedler, N, Suttiwan, P, Sullivan, MW, Ohman-Strickland, P, Panuwet, P, Barr, DB, Prapamontol, T, Naksen, W, SAWASDEE birth cohort investigative team et al.. Predictors of executive function among 2 year olds from a Thai birth cohort. Infant Behav Dev. 2024;74 :101916. doi: 10.1016/j.infbeh.2023.101916. PubMed PMID:38096613 PubMed Central PMC10947867
6. Rattanawitoon, T, Siriwong, W, Shendell, D, Fiedler, N, Robson, MG. An Evaluation of a Pesticide Training Program to Reduce Pesticide Exposure and Enhance Safety among Female Farmworkers in Nan, Thailand. Int J Environ Res Public Health. 2023;20 (17):. doi: 10.3390/ijerph20176635. PubMed PMID:37681775 PubMed Central PMC10487852
7. Li, Q, Lesseur, C, Srirangam, P, Kaur, K, Hermetz, K, Caudle, WM, Fiedler, N, Panuwet, P, Prapamontol, T, Naksen, W et al.. Associations between prenatal organophosphate pesticide exposure and placental gene networks. Environ Res. 2023;224 :115490. doi: 10.1016/j.envres.2023.115490. PubMed PMID:36828252 PubMed Central PMC10054353
8. Liang, D, Batross, J, Fiedler, N, Prapamontol, T, Suttiwan, P, Panuwet, P, Naksen, W, Baumert, BO, Yakimavets, V, Tan, Y et al.. Metabolome-wide association study of the relationship between chlorpyrifos exposure and first trimester serum metabolite levels in pregnant Thai farmworkers. Environ Res. 2022;215 (Pt 2):114319. doi: 10.1016/j.envres.2022.114319. PubMed PMID:36108722 PubMed Central PMC9909724
9. Baumert, BO, Fiedler, N, Prapamontol, T, Suttiwan, P, Naksen, W, Panuwet, P, Sittiwang, S, Dokjunyam, C, Smarr, MM, Marsit, CJ et al.. Investigation of Prenatal Pesticide Exposure and Neurodevelopmental Deficits in Northern Thailand: Protocol for a Longitudinal Birth Cohort Study. JMIR Res Protoc. 2022;11 (2):e31696. doi: 10.2196/31696. PubMed PMID:35129451 PubMed Central PMC8861866
10. Sittiwang, S, Nimmapirat, P, Suttiwan, P, Promduang, W, Chaikittipornlert, N, Wouldes, T, Prapamontol, T, Naksen, W, Promkam, N, Pingwong, S et al.. The relationship between prenatal exposure to organophosphate insecticides and neurodevelopmental integrity of infants at 5-weeks of age. Front Epidemiol. 2022;2 :. doi: 10.3389/fepid.2022.1039922. PubMed PMID:36925965 PubMed Central PMC10016628