DR. Nathan Yost

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Nathan Yost, M.D., is a retired physician and building scientist who specialized in the treatment of lung diseases and the investigation of moisture problems in both residential and commercial buildings. His love of construction began in high school when he worked part time for an architect in Honolulu. After college he spent a year working for a general contractor in Baltimore, MD, before moving back to Chicago in 1970 where he was self-employed as a carpenter and painter. For reasons that remain a mystery to many he went back to college taking pre-med courses that led to medical school at the University of Illinois in Chicago.

Fast forward through residency, pulmonary fellowship and several years in private practice to the year 2000. Realizing the importance of indoor air quality on the health of patients with asthma, Nathan became a consultant to the Health House program of the American Lung Association. At the suggestion of brother, Peter Yost, Nathan attended the Affordable Comfort Conference in Columbus, Ohio, where he met Betsy Petit and Joe Lstiburek of the Building Science Corporation. This led to a crash course in building science and forensic investigation under Joe’s guidance, followed by 3 years working for BSC.

For the next decade Nathan worked independently as a forensic investigator and as a consultant to builders and several manufacturers of building products. During his semi-retirement he continues to do some forensic investigations and has completed many major renovations on his own home and those of several family members.