Established in 1950, the National Book Awards recognize the best American writers as chosen by panels of prominent writers. Although the number of competition categories has changed over the years (currently awards are given for the best works in fiction, nonfiction, poetry, and young people’s literature), the significance of the prize has only increased.  It’s list of recipients include many of the country’s most impressive literary voices—and, of course, many Guggenheim Fellows are among those so honored.