Professor Ben Zion Katz, M.D. is a Professor of Pediatrics at the Northwestern University Feinberg School of Medicine and an Attending Physician  in  the Division of Infectious Diseases of the Anne and Robert H Lurie Children’s Hospital of Chicago.  He has also written on topics of Jewish interest related to Bible, liturgy and the calendar. He recently published A Journey Through Torah: A Critique of the Documentary Hypothesis.