Kory W. Johnson, MPH is an Environmental Scientist at J.S. Held with over ten years of experience in health sciences working in clinical and community health settings. He has led several public health initiatives, addressing social determinants of health and managing the impacts of infectious diseases in underserved communities. He has extensive experience analyzing health data, synthesizing research findings, and implementing evidence-based interventions to promote health and safety.
Michelle Bulnes is an Environmental Scientist focusing on environmental remediation, investigation, and consulting. She has worked in several project settings, including commercial, industrial, and residential. She specializes in environmental fieldwork, which includes project-specific tasks, assessments, inspections, and groundwater, air, and soil sampling. Michelle has experience in report writing and NJDEP documentation.
Jacob Munson-Decker is a Senior Health Scientist at J.S. Held who brings nearly a decade of experience in industrial hygiene, exposure assessment, toxicology, risk assessment, sampling and analysis, risk communication, and emergency response to chemical releases.
Ahira Medalla started her career in chemical risk analysis and thirdhand exposures. Her research focused on comprehensive two-dimensional gas chromatography with time-of-flight mass spectrometry-based nontargeted analysis to profile novel compounds and trace organic contaminants of concern. She has implemented sample preparation techniques, including solid-phase extraction and QuEChERS, to develop standard operating procedures that attain high extract recovery in complex matrices. As an Associate Health Scientist, Ms. Medalla aims to transition from assessing potential hazards to assessing occupational, environmental, and drug exposures.
Dr. Katrina Jew is a board-certified toxicologist (DABT) with a doctorate in toxicology from the University of Rochester and a research background in nanotoxicology, neurotoxicology, and inhalation toxicology.
Dr. David Fung is a Board-Certified Industrial Hygienist (CIH) with ten years of professional experience in consulting. He received his PhD in Industrial Hygiene, and his principal research was on the emission of and exposure to particulate matter generated during the operation of cooking ranges.
Amy Matey is a Data Analyst in our Environmental, Health & Safety practice. Her expertise includes coordinating consulting agreements, project setup, materials, deadlines, and deliverables, copyediting and formatting documents, running revenue reports, and managing office equipment, inventory, and functions.
Dr. Jessica Chopyk specializes in toxicology, exposure science, microbiology, and molecular research, with over a decade of experience in evaluating chemical and biological risks to human and environmental health across the United States and Israel. Her work focuses on reconstructing exposure to toxicants, assessing health risks, and analyzing causation between chemical exposure and disease. She has contributed to emergency response efforts involving hazardous substances and has led multidisciplinary research across public health, food safety, and environmental monitoring.
Makenzie Zima's experience includes conducting evaluations of the physical, chemical, and toxicological properties of chemical substances under the guidance of toxicologists and in accordance with agency screening standards, maintaining meticulous records and preparing reports/correspondence related to ongoing projects, and compiling data and scientific literature for expert reports and presentations.