John Collier

John Collier is at least two authors - J.C. (1901-1980), born in England and J.C.(1884-1968), an American social reformer and native American advocate. The former's works include several novels (e.g. His Monkey wife, Defy the Foul Fiend, etc.) and many short stories (e.g. as collected in Fancies and Goodnights): he also wrote about John Aubrey.

The latter is, presumably, responsible for the books about Native American issues.

JC (1913-1992) is a photographer.

There are a few books not easily attributable to either man - those on China, American Civil War graves and a Picture Puffin - which may mean there are more John Colliers.

I do wonder about the author's photograph which looks nothing like the picture on a 1948 copy of Defy the Foul Fiend - even allowing for the passage of time.
Added: I identified a couple of works as by J.C. (1884-1968) and assigned them #2. The photo could be an older version of one I found of him via Google Images. But I don't know why the copyright date on this one would be 2007.