![](https://cdn.statically.io/img/static01.nyt.com/packages/flash/multimedia/ICONS/transparent.png)
Dr. Diamond studying rats with the psychologist Mark R. Rosenzweig, left, and the biochemist Edward L. Bennett in an undated photograph.
Globe Photos; thumbnail, Elena Zhukova/University of California, Berkeley, 2010
Marian C. Diamond
Died on July 25, 2017 at age 90
Dr. Diamond was a neuroscientist who overturned long-held beliefs by showing that environmental factors can change the structure of the brain and that the brain continues to develop throughout one’s life.
Notable Deaths 2017
Remembering Mary Tyler Moore, Chuck Berry, Jerry Lewis, David Rockefeller, Trisha Brown, Glen Campbell, Dick Gregory, Edith Windsor, Sam Shepard, Tom Petty and many others who died this year.