The prestigious R M Johnston Memorial Medal, established in 1920 and awarded to a scholar of great distinction, has been won by Prof David Green AM, FAA, FRS. Born and educated in Tasmania, David Green is internationally recognised as a leader in experimental igneous petrology. It is an honour for The Royal Society of Tasmania to offer acknowledgment to David Green’s scholarship with this medal. He will deliver the R M Johnston Memorial Lecture on Tuesday 2 May in the Royal Society of Tasmania Room, TMAG Hobart, at 8 p.m. All interested people are warmly invited to attend.