Gregory Bateson was an English anthropologist, social scientist, linguist, visual anthropologist, semiotician, and cyberneticist whose work intersected that of many other fields. In the 1940s, he helped extend systems theory and cybernetics to the social and behavioral sciences. He spent the last decade of his life developing a "meta-science" of epistemology to bring together the various early forms of systems theory developing in different fields of science. His writings include Steps to an Ecology of Mind (1972) and Mind and Nature (1979). Angels Fear (published posthumously in 1987) was co-authored by his daughter Mary Catherine Bateson.