White pastel pencil on black charcoal paper.
This is the second time for this portrait. I did the same one in 1976 and gave it to a Dr. Peter Hamel and his wife Hanni, of Braunschweig, Germany. I met Peter when we were both going to MIT and became best friends. Peter became an accomplished aerospace engineering executive in Germany before retiring 8 years ago. I wanted a version for my collection.