Dr. Douglas O. ReVelle, a Postdoctoral Fellow at DTM from 1977 to 1978, passed away on 2 May following a brief illness.  ReVelle was recruited by then-director George Wetherill to work on improving estimates for the flux of meteoroids on Earth from observations of terrestrial meteors.  While at DTM, ReVelle determined observationally the luminous efficiency of the Lost City and Innisfree meteorite falls, he developed a new method for estimating the pre-atmospheric velocity of meteoroids by combining his entry model with ablation losses determined from cosmic ray tracks, and he examined fireball observations from the Prairie Network to identify the stony meteoroid fraction.

ReVelle later taught at Northern Arizona University, Northern Illinois University, and the University of Western Ontario, and he worked in the Earth and Environmental Sciences Division at the Los Alamos National Laboratory for 16 years before his retirement in February of this year.  He continued to collaborate with Wetherill after his time as a DTM Fellow, and he spent time on campus as a visiting investigator in 1979 and again in 1984.