William E. MacQuinn 
Last updated: 22.06.17
All that can presently (May 2013) be gleaned about by internet searching is that William E. MacQuinn is the one-off composer of The Rag of Rags (1915) published by Chappell & Co., New York, USA.
Surfers are welcome to contribute information about this composer.

Further sheet music at DBE: ON HOLD