John S. Marr, MD, author of The Eleventh Plague, served as director and
principal epidemiologist for the New York City Department of Health. He is the coauthor of The Black Death and
is the author of three books for children on public health concerns, drugs,
smoking, and proper nutrition. Marr is also author of more than fifty medical journal
articles and is a frequent op-ed
contributor to the Medical Herald. He lives in Connecticut with his wife, daughter, three Jack Russell
terriers, and a mutt rescued from a pit bull encounter.