I literally hung on every word he said (misspellings and all), lol.
He had all that practical, hands-on experience, a brilliant mind, and the engineering degree. He also taught HVAC. And he was so very willing to give of his time to teach us anything for free. He had a knack for making things understandable, and helping you to see the big picture.
We have people on this site who are really sharp in specific areas of HVAC, but the width of his knowledge was just unbelievable. I don't think it's an overstatement to say that he raised the level of knowledge here considerably.