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Medical Research

Dr. John W. Littlefield, Johns Hopkins physician-scientist whose work dramatically advanced the field of genetics

Dr. John W. Littlefield, Johns Hopkins physician-scientist whose work dramatically advanced the field of genetics

Dr. John W. Littlefield, a former chairman of pediatrics and physiology at the Johns Hopkins University School of Medicine whose research advanced the field of genetics and touched countless lives, died April 20 of complications from dementia at his home in the Broadmead retirement community in Cockeysville. He was 91.

Dr. Littlefield's research focused on the use of human cells "as a valuable tool in scientific experimentation, including studies on how our cells age," his daughter, Elizabeth Lascelles Littlefield of Washington, wrote in a biographical profile of her father.

Dr. Littlefield's accomplishments included playing a leading part in discovering the role...

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