Dr. Ian Hers, as Principal and Founder of Hers Environmental Consulting, Inc., has over 30 years experience in soil vapour intrusion characterization and mitigation, assessment and management of LNAPL impacted sites, and assessment of natural attenuation and biodegradation including monitored natural attenuation and natural source zone depletion. Dr. Hers has a deep knowledge of soil vapour intrusion and has assisted clients worldwide throughout his career in developing guidance, models and methods. He has published over 25 technical papers and guidance documents on vapour intrusion. He has outstanding experience in assessment of natural attenuation of chemicals and management of LNAPL contamination and has supported private and public clients in development of guidance and protocols in these areas. He has conducted numerous applied R&D projects and supported developed of guidance worldwide for regulatory agencies in Canada, US, UK and Israel, for organizations such as American Petroleum Institute and Electric Power Research Institute, and oil and gas clients. Dr. Hers holds a Ph.D. from the University of British Columbia, has served as lecturer at UBC, and is on the Board of Directors for the Science Advisory Board for Contaminated Sites in British Columbia.