Origin of Galactic Cosmic Rays

Despite their discovery over 100 years ago, we are only recently beginning to understand and identify the cosmic sources of galactic cosmic rays. In this talk I will discuss what we know and what we hope to learn about the cosmic-ray source. I will focus in particular on efforts to measure cosmic rays with an atomic number Z\textgreater 30. These ultra-heavy cosmic rays are only produced in supernova explosions as a result of neutron capture and provide an excellent indicator of the nature of the cosmic-ray source. I will present data from past balloon and satellite experiments as well as the recent SuperTIGER balloon experiment which flew over Antarctica for a record 55 day flight and discuss what the future holds for ultra-heavy galactic cosmic-ray measurements.