I found missing class member Jack King thanks to a clue by Norm Rowley. Norm last saw him in the 1960s shortly after Jack had gotten an MBA from Harvard. A simple Google search on “Jack King” and Harvard turned up Jack’s company, Newman-Johnson-King, an executive and engineering headhunting firm in Texas.
Jack had been in the middle of a divorce at the time of our reunion, but is now newly married to the partner in his firm where he is still working as hard as ever. (A new wife will do that to a man.) They live on the coast about 250 miles south of Houston.