Craig Marden is a Field Application Specialist in the Building Science/Sustainability group at Owens Corning and formerly Adjunct Faculty in the Building and Construction Technology Program and the University of Massachusetts at Amherst. For 20 years he has worked in construction, weatherization and energy efficiency retrofitting, conducting thousands of blower door tests on new and existing residential buildings. Focusing on energy efficient and green construction and has professional experience as: Construction Manager, Carpenter, HERS Rater, LEED for Homes Rater, Energy Auditor, Heating system installer, Solar thermal installer, Air sealing technician. He holds a Massachusetts Construction Supervisor License. He is also a Certified Passive House Consultant.