Donald I A MacLeod earned an M.A. from the University of Glasgow in 1967 and his Ph.D. in 1974 from Cambridge University. In 1974, he came to the University of California Sand Diego where he is today Professor Emeritus. He is a Fellow of OSA and received the 2006 Edgar D. Tillyer Award “for unparalleled virtuosity in the psychophysical dissection of the visual pathway into the stages that culminate in color, spatial and temporal vision.”