Professor Street is distinguished for his experimental and theoretical contributions to magnetism. His main work is on two aspects: 1. Magnetization processes in ferromagnetic materials. Street analyzed the time dependence of magnetization, particularly of high coercivity materials, and verified his theoretical predictions experimentally. He developed a unified theory of the elastic properties of ferromagnets in terms of fundamental domain processes and this theory accounts for a wide variety of experimental data. 2. Magnetic interactions in solids. This work is elucidating the magnetic structures of anti­ferromagnetic metallic systems by neutron diffraction, magnetic susceptibility, magnetoresistance, and elasticity measurements. Since his arrival in Australia, Street has built-up an active and inspired research school in solid state physics.