Studies of the interactions of relativistic heavy nuclei with particular emphasis on the influence of these interactions on the abundances of the nuclei in the cosmic radiation. These studies are conducted by a number of different collaborative groups. The KLMM group uses nuclear emulsions to study interactions of nuclei accelerated at Brookhaven and CERN. The UHIC collaboration uses electronic arrays to study the leading fragments from interactions produced by very heavy ions accelerated at LBL and Brookhaven. I am the spokesperson for these two colaborations. The Transport collaboration has used the HISS magnetic spectrometer at LBL to study the production of light isotopes from beams of lighter nuclei. I am also involved with the TIGER collaboration to design and construct a prototype detector of cosmic ray UH nuclei for initial exposure on a long duration balloon and later exposure in space.