Thanks for sharing, Trevor. Stunning, amazing photos, and a fascinating story.
John Maloof is the person who bought many boxes of Vivian Maier's slides at an auction in 2007. He has a web site about her work here:
http://www.vivianmaier.blogspot.com/
Ron Slattery is a friend of Maloof's brother. Slattery also attended the 2007 auction, and bought seveal boxes of undeveloped film shot by Maier. He's reportedly the person who validated John's view that the photos were exceptional, and important. Slattery later sold the undeveloped film to Maloof.
A third photography enthusiast named Jeff Goldstein has created a web page about Maier's work:
http://www.vivianmaierphotography.com Goldstein has acquired collections of photos purchased by others who attended the auction in 2007. Goldstein has formed a company, Vivian Maier Prints, to sell copies of the material he owns.
The notion that Maier's work is valuable in monetary terms is gaining traction. There are reports that Maloof, Slattery and Goldstein are each jockeying for a position to cash in on the trove of photographs.
It appears that Maier used medium format Rolleiflex twin lens reflex cameras for much of her work. Maloof owns several of the cameras.