I was able to speak with Dave Roberts just before he retired from the National Renewable Energy Lab after a full carrier leading a group of talented engineers and scientists who have been leveraging computer modeling and simulation to address pressing residential building efficiency, electrification, and carbon related issues in our country.   I first met Dave when he worked in software development with REMRate which at the time was the most widely used energy modeling software developed to create the RESNET HERS Energy Rating Index. He has been heavily involved with RESENT over the years as a member of the ANSI standards development committee and chair of the software calculations subcommittee.  We have become friends, and I wanted to be sure to speak with him on the buildCAST before his retirement to be able to better understand his carrier and catalog is contribution to our industry.    Unfortunately, my side of the conversation did not record well and sounds a bit rough, but luckily for you Dave did most of the talking and he is well worth listening to. What he has to say puts a lot of our applied building science and other work with residential buildings into better context and he leaves a research question on the table for us to aspire to answer, hopefully in the near future.   Thanks, Dave, for all you have done, and I truly hope you have a wonderful and fruitful next stage of life.  All the best. Dave Roberts on LinkedIn National Renewable Energy Laboratory RESNET