Read the bio below and try to give details on nan laird 's:    - known for     - doctoral advisor     - workplaces       - awards     - birth date     - name     - alma mater     Bio: nan m. laird -lrb- born september 18 , 1943 -rrb- is a professor in biostatistics at harvard school of public health . she served as chair of the department from 1990 to 1999 . she was the henry pickering walcott professor of biostatistics from 1991 to 1999 . laird is a fellow of the american statistical association , as well as the institute of mathematical statistics . she is a member of the international statistical institute .
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- known for is expectation-maximization algorithm- doctoral advisor is arthur p. dempster- workplaces is harvard school of public health- awards is fellow the institute of mathematical statistics of the american statistical association , fellow of- birth date is 18 september 1943- name is nan m. laird- alma mater is harvard university