Marcus was a senior editor at NPR where he worked off and on for 30 years. During his time there he held a variety of positions, including executive producer of "Talk of the Nation," senior editor of the national desk and senior editor of "All Things Considered." For five years he headed up an NPR unit that conducted, and reported on, in-depth polls on topics as diverse as taxes, immigration and education. His work has won numerous awards, including two duPont-Columbia Awards. He is the author of "Heart of a Wife: The Diary of a Southern Jewish Woman", his grandmother’s diary, which he edited and supplemented with an introduction and explanatory essays.