Professor McKeegan of UCLA, a graduate of the physics department and the Laboratory for Space Sciences, will be giving the McDonnell Distinguished Lecture next month at Wash U. McKeegan and his research group have done a lot of really fantastic work. In my opinion, McKeegan and team’s measurement of the oxygen isotopic composition of the Sun was the single most important measured ever made in cosmochemistry, and indeed one of the key findings in all of planetary science. This measurement has motivated a lot of the work our group is doing right now. We’re very excited to have him back in St. Louis!