Robert Hunter is several authors, including:
#1 Robert Hunter the Grateful Dead lyricist / poet
, born 1941-06-23.
#2 Robert Hunter the environmentalist and co-founder of Greenpeace
, born 1941-10-13 - died 2005-05-02.
#3 Robert Hunter, the golfer
(and, presumably, golf course designer), born 1886-11-20 - died 1971-03-28.
# Robert Hunter the social activist
, was born in 1874 and died 1942-05-15. He authored books on poverty, socialism, labor, and religion.
# Robert Hunter, the dictionary author.
# Robert Hunter, author of books about ceramics (series info here
# Robert Hunter, wrote about poverty in the 1960s (probably not related to the social activist who wrote about poverty).