EditorialDr. Robert Stadtmauer, a hematologist-oncologist at the University of Pennsylvania, in Philadelphia on June 23, 2022. (Hannah Yoon/The New York Times)
EditorialDr. Ariela Marshall, a hematologist at the Mayo Clinic, outside the hospital in Rochester, Minn., May 21, 2020. (Jenn Ackerman/The New York Times)