My deepest sympathies to Greg's spouse and family on his passing. I knew Greg through his work first at Trow and then at exp. He was an expert's expert and was the building envelope expert of choice whenever a client had a problem to solve. He was a joy to work with, lively, warm, thoughtful and with a mischievous smile. My heart goes out to his family and colleagues. Greg could simplify complexity with an ease I have rarely seen. I was surprised and touched to see his love of music, and it is clear that he was a well loved and well rounded person. The world was a better place to have had Greg with us for the time that we did.