Which university's biology department did Watson join as faculty in 1956?

James Watson joined the biology faculty of Harvard University in 1956. He remained associated with Harvard’s Biology Department until 1976, conducting research focused largely on molecular biology and RNA.

Watson arrived at Harvard after his Cambridge collaboration with Francis Crick had produced the 1953 DNA double-helix model. At Harvard, he helped build the department’s strength in the emerging field of molecular biology, studying how genetic information is expressed and transferred. His appointment placed him in one of the major American centers for postwar biological research.

The question refers to Harvard University in Cambridge, Massachusetts, not the University of Cambridge in England, where Watson had earlier worked at the Cavendish Laboratory. Watson later became director of Cold Spring Harbor Laboratory, although he continued as a Harvard faculty member for part of that transition.