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 former 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 Y. Paik, PhD, CIH, CSP is an industrial hygienist at the Lawrence Livermore National Laboratory (LLNL) where he currently leads the Industrial Hygiene Exposure Assessment Program and is a Field Support Lead. Sam was previously LLNL’s Nanotechnology Safety SME 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. Sam previously provided oversight to the National Ignition Facility and Explosives Testing Site at LLNL, and currently participates as a responder for the DOE/NNSA Nuclear Emergency Support Team (NEST). Sam has authored over 20 peer-reviewed publications and book chapters in subjects ranging from modeling of particle size selective samplers, characterizing beryllium exposures from X-ray vaporization, and control banding for nanoparticle risk assessments. Sam received a B.A. in Integrative Biology at UC Berkeley, an M.S. and PhD in Industrial Health from the University of Michigan, and has over 20 years of experience in worker safety and health. Sam is a former chair of the AIHA Aerosol Technology Committee, and in 2023, was awarded the AIHA Fellows SIG Mid-Career Award for his contributions to the IH profession throughout his career.
John Cala, MS, CIH is an Industrial Hygienist and Team Leader with Lawrence Livermore National Laboratory (LLNL) where he also serves as the Nanomaterials subject matter expert. Mr. Cala has a B.A. in Environmental Studies from the University of Pittsburgh and a M.S. in Chemistry from the University of North Carolina Wilmington. He is a Certified Industrial Hygienist and has 10 years of comprehensive experience in Environmental, Health, and Safety in both public and private sectors. Mr. Cala is an active member in the American Industrial Hygiene Association and a member of the Future Leaders Institute (FLI) Class of 2022. At LLNL he has supported the construction group, plutonium and tritium facilities, and is currently the ES&H team leader for the Global Security Directorate.
Juliana Halbach, MPH, CIH is an Industrial Hygienist and Industrial Safety Professional (IH/IS) with Lawrence Livermore National Laboratory (LLNL). Juliana received a B.S. in Public Health from Tulane University and an M.P.H. in Industrial Hygiene from the University of Texas Health Science Center at Houston. She is a Certified Industrial Hygienist and has 4 years of industrial hygiene and safety experience. At LLNL she supports biology, chemistry, physics, and materials science research and development activities, where she utilizes control banding risk assessment approaches daily. She also participates as an IH/IS responder for the DOE/NNSA Nuclear Emergency Support Team (NEST).
