I was a grad student of Dr. Harper's in the late 70s and have to say that he was the best instructor I have had throughout my educational pursuits. I remember the first time I met him, he was running up the steps, two at a time, in a hurry for "something", but still had the time to say "hello". I don't remember the number of the course, but there was one where he would merely state a problem from his experience in working with industry, and the students would have to ask questions and find out what happened, and what you would do to fix and prevent it from happening again. It was an excellent way to prepare us for real-life manufacturing experiences.
I also remember helping him cut down trees in his yard one weekend, and the pride he took in making everything look just right. He was a good man, and my condolences go out to his family and friends. I respected him, and shall miss him.