Dr. Dallas Cowan is a Board-Certified Toxicologist (DABT) and Certified Industrial Hygienist (CIH) with more than 15 years of consulting experience in occupational toxicology, industrial hygiene, exposure, and human health risk assessment.
Dr. Angie Perez is a Certified Industrial Hygienist (CIH), the Principal Toxicologist, and Senior Technical Fellow of Industrial Hygiene for J.S. Held, LLC. She has over 20 years of experience in human health risk assessment, toxicology, exposure and risk assessment, sampling and analysis, and risk communication.
Dr. Jun Wang brings a diverse set of skills and knowledge to the field of toxicology, with a background that encompasses computational toxicology, molecular microbiology, and hands-on experience in both the public and private sectors. His career spans academia, government agencies, and the private sector, giving him a unique perspective on applying cutting-edge techniques to complex toxicological challenges.
Adory Khandaker is a Toxicologist at J.S. Held. She specializes in toxicology and the analysis of quantitative and qualitative data. She has years of research experience in toxicology, epidemiology, global health, and the natural sciences from her work and academic background.
Faith McRoberts specializes in Environmental Science and Industrial Hygiene. She is involved in inspecting, project management, and hazardous material emergency response throughout the St. Louis Metro area. She has assisted in completing Phase II Site Assessments, asbestos, lead, mold, and Indoor Air Quality (IAQ) projects.
Dr. Payam Fallah has over 25 years of experience in mycology and indoor air quality as a consultant and expert in investigations throughout North America and the Caribbean. He is a mycologist who has evaluated mold cases involving commercial and residential buildings regarding mold growth, aerosolization and exposure, as well as fungal wood decay compromising the structural integrity of building materials.
Justin Soliz joined J.S. Held in August 2024 as the Mid-Atlantic Project Manager, specializing in Industrial Hygiene and Environmental, Health, & Safety (EHS) management and consulting. With over 20 years of experience in restoration, property adjusting, and environmental consulting, Justin provides expert services to diverse clients. He has conducted hundreds of environmental assessments, including mold assessments and protocols, asbestos surveys, water and smoke damage assessments, lead-based paint risk assessments, and indoor air quality investigations.
Arthur "Art" Clarke, JD, has over 40 years of experience as an environmental consultant and attorney. He specializes in litigation support, expert witness services, transactional support, due diligence, and regulatory compliance matters and has extensive technical experience as a project manager and analytical chemist. Art also provides regulatory counseling and consulting to clients appearing before state and federal administrative agencies, administrative law proceedings, and plenary courts. He oversees J.S. Held's substantial environmental litigation and advisory support services, providing expert witness, litigation support, and sustainable financial consulting to a global clientele.
Dr. Phillip Ludvigsen specializes in environmental litigation support, ESG, and sustainable financing, such as green bond development and verification. He has authored and co-authored expert witness reports, rebuttals, and settlement memorandums for mediation, allocation, regulatory oversight, and litigation engagements, including superfund mega-sites, manufactured gas plant (MGP) cleanup programs, insurance claims, and international dispute resolution.