This interview with Donald Groom discusses when he joined the Supernova Cosmology Project (SCP) after the demise of the Superconducting Supercollider (SSC). He possessed a childhood love for astronomy but majored in chemistry at Princeton University, turning to graduate work in physics with a minor in astronomy at the California Institute of Technology. From a career in high energy physics, Groom brought expertise in statistics to the SCP; he wrote the light curve fitting software, importing the code from CERN, converting Minow to SN-Minow and introduced the problem of data correlations to the group. Groom has significant contributions to the Particle Data Group book and booklet. For example, as an editor, he invited the section on the Hubble Constant in 1996, which evolved into the section on cosmological parameters. He describes the SCP's development of supernova image capture methods, wide field cameras, and supernova spectra taking, and the seven supernova paper of 1997 as demonstration that supernovae are standard candles without concluding about the cosmology. He relates how the SCP first tried to image clusters of galaxies, went away from that, and returned to it with the Hubble Space Telescope (HST). He views the SCP as first of the large groups in astronomy and describes the difference between high energy physics and work in the SCP.