Emma P. Sellers 
Last updated: 22.06.17
All that can presently (January 2016) be gleaned about by internet searching is that Emma P. Sellers is the one-off composer of Roosevelt's the Man March (1905) published by W.J. Dyer & Bro., St. Paul, Minnesota, USA.
Surfers are welcome to contribute information about this composer.

Further sheet music at DBE: ON HOLD