In this interview, John Carpenter discusses topics such as: his graduate school work in nuclear engineering; his early professorship at the University of Michigan; going to the Reactor Testing Station in Idaho to learn about neutron scattering; beginning work at Argonne National Laboratory; developing the first-ever pulsed spallation neutron sources equipped for neutron scattering, ZING-P and ZING-P'; development and implemention of the intense pulsed neutron source (IPNS); becoming an advisor at Oak Ridge National Laboratory; spallation neutron source (SNS); his retirement; slow neutron scattering; Motoharu Kimura and winning the Clifford G. Shull prize.