Grieg and I worked together for ten years @ NG and in a group of really brainy people, Grieg definitely stood out. It wasn't his intellect that caught my attention, but the quiet, reserved manner in which he broke problems into their smallest components and methodically solved them in a way that would cause a super-computer to glitch. Grieg was never seemed rushed; his hallmark was just constant progress, -until the next challenge came his way.
He and I shared a passion for astrophotography and had many great discussions on the subject. On the my final day before retiring two years ago, I made it a point to make his office my last stop and my final goodbye.
I just found out about his passing and like everyone else that knew him, I'm devastated. Our loss is Heaven's gain. RIP my friend and my most heart-felt condolences to his family.