Thanks for the reply Rachel.
I studied with Dave off and on while in college. After moving to Phoenix in 1993 I would look forward to the televised 4th of July concerts. It was a chance to see old friends like Dave and Adel.
I would like to encourage any past students to post here. To reflect on his talents as a teacher and trumpeter, and to comment on his human qualities... he had great wit and charisma...
He loved telling a story on me... It goes something like this...I would meet him at his mothers townhouse in Alexandria sometimes for lessons... I was just out of High School. I was told to use the back entrance / basement door. One day as I came down the steps I encountered a young couple having an afternoon "get together". Lets just say they were way to busy to even notice me. The instructions were to come in and warm-up. Dave would hear me and come down to give the lesson. Anyway, I waited as long as I could and then proceeded to go to the front door. He was puzzeled why I did this and I was to embarassed to explain. He continued asking what was up thoughout the lesson... finally I gave in and tried explaining... what cracked him up
... and why I think he loved telling the story is that I couldn't quite say what they were doing...
but I could make gestures to "suggest" what they were doing 
... and so it became a rather infamous story....
I remember many times meeting the trumpet section back stage at the Kennedy Center and Dave would start this story... and I would turn a few shades of pink
.