sentences:  Fleming was a vocal advocate of, and practitioner in, the effort to extend the application of historical linguistic methods as far as possible into the past.He recommended integrating its results with those of physical anthropology, genetics, and archaeology, in order to produce a unified view of human prehistory.Fleming was also a strong supporter of the sometimes controversial proposals of Joseph Greenberg, emphasizing the success of Greenberg's classification of "1500 [African] languages into four large taxa where almost all have stayed ever since" (Fleming 2000-2001).