The Library of Congress digital photo collection is part of the Flickr commons project. Over 40 participating institutions have been scanning and uploading digitized photos to Flickr. Flickr members are encouraged to add comments and provide missing information about the photos. This is perfect for a vintage photo hound who also enjoys researching old photos.
This image was posted to the Library of Congress digitized collection with only the title 'F.A. Mullen' and the source, Bain News Service 1913. It was cross-posted to Flickr and, about a year later, a summary was added and credited to the Flickr Commons Project (2009).
Summary: Photo shows diver Frank Aloysius Mullen (1887-1945) diving from the platform of the New York Athletic Club summer home, Travers Island, Pelham Manor, New York. (Source: Flickr Commons project, 2009).
If you read the Flickr Commons comments you can see, more or less, how the summary was uncovered. I'm Chicajoan. The LOC person who updated the collection also posted a brief Wikipedia entry for Mr. Mullen.