In this interview, K. G. Wilson discusses the development of the renormalization group. Topics discussed include: Andrew Pickering; the Kondo problem; Ken Johnson; Francis Low; Freeman Dyson; field theory; A. A. Katanov; Michael Fisher; G. Jona-Lasinio; Carlo Di Castro; Franz Wegner; Alexander Patashinski; Valery Pokrovsky; Curtis Callan; Kurt Symanzik; University of Washington Department of Physics; research on teaching physics; s-matrix theory; Peter Carruthers.