Please answer the following question: What type of details about brian k. hall can be gathered from the following bio? Bio: brian keith hall is the george s. campbell professor of biology and university research professor emeritus at dalhousie university in halifax , nova scotia . professor hall has researched and extensively written on bone and cartilage formation in developing vertebrate embryos . he is an active participant in the evolutionary developmental biology -lrb- evo-devo -rrb- debate on the nature and mechanisms of animal body plan formation . professor hall has proposed that the neural crest tissue of vertebrates may be viewed as a fourth embryonic germ layer . as such , the neural crest - in hall 's view - plays a role equivalent to that of the endoderm , mesoderm , and ectoderm of bilaterian development and is a definitive feature of vertebrates -lrb- as hypothesized by gans and northcutt -rrb- . as such , vertebrates are the only quadroblastic , rather than triploblastic bilaterian animals . in vertebrates the neural crest serves to integrate the somatic division -lrb- derived from ectoderm and mesoderm -rrb- and visceral division -lrb- derived from endoderm and mesoderm -rrb- together via a wide range novel vertebrate tissues -lrb- bone , cartilage , sympathetic nervous system , etc. . . -rrb- . he has been associated with dalhousie university since 1968 . since his retirement in 2007 , he has been university research professor emeritus and emeritus professor of biology .
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