This week on IAQ Radio Bud Offermann returns to discuss new research on E-Cigarettes, ventilation and more. Mr. Offermann has over 25 years experience as an IAQ researcher, sick building investigator, mitigation planner, healthy building design consultant, expert witness, technical author, and workshop instructor. He is president of Indoor Environmental Engineering, a San Francisco based IAQ consulting firm. Under Mr. Offermann's supervision IEE has developed both pro-active and reactive IAQ measurement methods and diagnostic protocols. He has been a recipient of State and Federal research grants regarding building air quality and ventilation field studies (e.g. EPA BASE study of IAQ in office buildings and schools), tracer gas techniques, in situ contaminant emission rate measurements, and the development of indoor air quality measurement instrumentation. Prior to starting up Indoor Environmental Engineering, Mr. Offermann was a Staff Scientist with the Building Ventilation and Indoor Air Quality Program, Energy and Environment Division, Lawrence Berkeley Laboratory, Berkeley, CA.