Dr. Louis Greenspan (1934 -2018) was Emeritus Professor in the Department of Religious Studies at McMaster University, Canada. He first came to the university in 1967, at the invitation of George Grant, to teach sociology of religion at McMaster’s pioneering department. Later he also taught courses related to this research–in Jewish History in the Modern Age. Louis was a founding member of the Arts & Science Program, where he developed courses on Contemporary Intellectual History as well as Research Inquiry. Dr. Greenspan also conducted research on modern liberal thought and on religion and secularism in the post-war period. In addition, Louis focused on the work of Bertrand Russell, the subject of his PhD dissertation. He was Director of the Bertrand Russell Editorial Project from 1994 to 1997 and its managing editor from 1986 to 1994. He also chaired the Bertrand Russell Archives Copyright Permissions Committee, and served as a co-editor of volume 14 of the Collected Papers.