About Us

David Zalk

David M. Zalk, PhD, CIH is a past president of the International Occupational Hygiene Association and currently serves as their envoy. Leading numerous national and international committees over the last three decades, he remains an active leader on multiple philanthropical boards of directors. David is recognized worldwide as an expert on Control Banding and qualitative risk assessment strategies, receiving his PhD at the Delft University of Technology in the Netherlands. David is a Team Leader at the Lawrence Livermore National Laboratory (LLNL), an award-winning industrial hygienist, and remains actively involved in research and development within the greater occupational health and safety sciences. Authoring over 50 journal articles and book chapters, his research includes: nanomaterial sciences, metals capture and analysis, biological and toxicological decontamination agents, occupational biomechanics, risk communications, qualitative risk management, and developing occupational health and safety management systems.


Samuel Paik

Samuel Y. Paik, PhD, CIH is an industrial hygienist at the Lawrence Livermore National Laboratory (LLNL) where he currently serves as program lead for the Industrial Hygiene Exposure Assessment Office and as institutional Beryllium Subject Matter Expert and Respirator Program Administrator. Samuel was previously LLNL’s Nanotechnology Safety Subject Matter Expert and played a central role in establishing LLNL’s first Nanotechnology Safety Program, which incorporated a control banding approach as its primary method for risk assessment and control. Samuel previously provided oversight to the National Ignition Facility and Explosives Testing Site. Samuel has authored over 20 peer-reviewed publications and book chapters in broad subjects ranging from modeling and development of particle size selective samplers, characterization of beryllium exposures from X-ray vaporization, control banding for nanoparticle risk assessments, and quantitative validation of similar exposure groups. Samuel received a B.A. in Integrative Biology at UC Berkeley and an M.S. and PhD in Industrial Health from the University of Michigan. Samuel is a past chair of AIHA’s Aerosol Technology Committee.


Wesley Chase

Wesley Chase, CIH is an Industrial Hygienist and Team Leader with Lawrence Livermore National Laboratory (LLNL) where he also serves as the Nanomaterial subject matter expert. Mr. Chase graduated from the University of Oklahoma with a B.S. in Environmental Science and is a Certified Industrial Hygienist. He has 15 years of comprehensive experience in Environmental, Health, and Safety. Mr. Chase has experience in health and safety plan development and review, industrial hygiene sampling, noise assessments, nanomaterial evaluations, radiation safety, chemical hygiene/lab safety, healthcare infection prevention, hazardous materials, and environmental risk assessments. Wes is a member of the American Chemical Society and the American Industrial Hygiene Association where he is a committee member for the nano and advanced materials working group, toxicology committee, and the laboratory health and safety committee. Wes has a published article with the Laser Institute of America on non-beam laser hazards that include nanomaterials.