James D. Watson, the brilliant but controversial American biologist whose 1953 discovery of the structure of DNA, the molecule of heredity, ushered in the age of genetics and provided the foundation for the biotechnology revolution of the late 20th century, has died at the age of 97.

His death was confirmed by Cold Spring Harbor Laboratory on Long Island, where he worked for many years. The New York Times reported that Watson died this week at a hospice on Long Island.

In his later years, Watson's reputation was tarnished by comments on genetics and race that led him to be ostracized by the scientific establishment.

Even as a younger man, he was known as much for his writing and for his enfant-terrible persona — including his willingness to use another scientist's data to advance his ow

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