Conversation so far:
What did Frederick Law Olmsted help conserve?
Frederick Law Olmsted was an early and important activist in the conservation movement, including work at Niagara Falls.
What is another region Frederick Law Olmsted helped conserve, besides Niagara Falls?
Frederick Law Olmsted was an early and important activist in the conservation movement, including work at the Adirondack region of upstate New York.

Question: Did he join any association for conservation?
Self-contained rewrite: Did Frederick Law Olmsted join any association for conservation?