Michael Johnson Astrophysicist, Harvard-Smithsonian CfA Michael D. Johnson is a Smithsonian astrophysicist, a lecturer in the Harvard Department of Astronomy and an inaugural member of the Harvard Black Hole... Read more about Michael JohnsonMichael Johnson's Website160 Concord Ave, MS-42 Cambridge, MA 02138 Office M-103Cmjohnson@cfa.harvard.edup: 617-496-7638