Professor David Green is distinguished for his research on the composition and structure of the earth's upper mantle and on the origin of basalt magmas. He was the first to combine the techniques of high pressure experimental petrology with electron microprobe analysis, making it possible to arrive at a quantatitive understanding of the generation and fractionation of complex (10 component) natural magmas, as a function of pressure and temperature. Green has used these techniques to obtain solutions to several of the most fundamental and long standing problems of petrology. He is also renowned for his experimental and petrological studies of metamorphic rocks of deep crustal and upper mantle origin and of high temperature peridotite intrusions.