Erik Nelson joined J.S. Held in May of 2026 as part of J.S. Held's acquisition of Clark Seif Clark, Inc.
Tracey Fanning is a senior regulatory and toxicology professional with nearly 20 years of experience and is widely recognized within the industry for her expertise in cosmetic and consumer product compliance, product safety, and scientific affairs across global markets. Her expertise spans cosmetics, personal care, food, toys, supplements, and broader consumer products.
Kevin Mandemaker specializes in the field of industrial hygiene and environmental health and safety management and consultation. With over 10 years of professional experience, Kevin provides consulting and expert services for a diverse group of clients. He has performed hundreds of environmental assessments, which include mold assessments, asbestos inspections, water and fire/smoke damage assessments, lead-based paint inspections, indoor air quality monitoring, personal air monitoring, and asbestos air monitoring.
Dr. Nadia Moore is a Senior Technical Fellow in Toxicology at J.S. Held, LLC. She has more than 25 years of multidisciplinary experience in toxicology, exposure science, regulatory compliance, molecular biology, and analytical chemistry.
Jeff McCurdy is a Project Manager with over 12 years of experience in environmental remediation, specializing in complex multi-media, multi-contaminant cases. Jeff began his career in environmental remediation in 2008 with Brennan Environmental, Inc., which joined the J.S. Held family in February 2020.
Nicholas "Nick" Potkalesky is a Senior Project Manager with over 18 years of experience in environmental remediation. He specializes in complex remedial cases at commercial and industrial properties where many contaminants and areas of concern must be addressed. He also works on legacy sites to achieve regulatory compliance. While working with an incredibly talented team from the Summit, New Jersey office, it is his privilege to help clients navigate the dynamic landscape of environmental compliance.
Diana Gonzalez specializes in clerical tasks, including filing, customer care, and data entry. She can exceptionally handle change and manage multiple priorities.
Danielle Pomponio is an Environmental Scientist / Industrial Hygienist specializing in environmental due diligence, site investigation, and remediation for residential, commercial, and industrial properties.
Sydnie has a background in public health, toxicology, and basic science. Before joining J.S. Held, she was a Graduate Research Assistant at the U.S. Environmental Protection Agency, where she was involved in toxicology, climate, and housing enrichment research.