title: Obituary: Bohdan Paczyński (1940-2007).
authors.affiliation: Bruce T. Draine and Jeremiah P. Ostriker are in the Department of Astrophysical Sciences, Princeton University, Princeton, New Jersey 08544-1001, USA.draine@astro.princeton.edu.
authors.forename: Bruce T
authors.initials: BT
authors.lastname: Draine
authors.forename: Jeremiah P
authors.initials: JP
authors.lastname: Ostriker