I was saddened to learn of Dan's passing. I worked with Dan's group on the first DSCS-III spacecraft- back in the 70s. It was a hectic, stressful period but Dan managed to keep the work environment at a reasonable level. He has been praised for his
expertise as a technical manager. but I have always considered him as a "people" manager, not always an attribute of technical managers. My Sympathy to his wife and family.