Greg Nahn

Senior Building Science Specialist

Greg has spent two decades leading the design, delivery, and promotion of award-winning residential energy efficiency programs across the country. At Slipstream, Greg oversees 100 independent raters and thousands of quality assurance reviews in compliance with RESNET®, ENERGY STAR®, and other program/certification requirements. Greg develops and implements curriculum for a number of the BPI courses—playing a key role in preparing candidates for certification exams. He is a BPI Certified Professional, a RESNET HERS Rater, and RESNET accredited rater trainer, and is a regular presenter at local, regional, and national conferences.