I recently saw Brian Winston speak in support of a (very expensive) documentary on Robert Flaherty, ”˜A Boatload of Wild Irishmen,' for which he wrote the script. There is a little interview with Leacock in the film where he talks about working as Flaherty's cameraman on "Louisiana Story." Leacock's career was a truly expansive one.
Here's a link to Leacock's recollection of this experience of working with Flaherty from his website:
http://www.richardleacock.com/21188/On-Working-With-Robert-and-Frances-Flaherty
RIP