Biographical details are found on Bill Edwards’ website:
This piece was published in two different editions, both are hold at the York University’s Institutional Repository.
The second edition from 1907 published by Victor Kremer Co. is also found in the Charles Templeton Sheet Music Collection at the Mississippi State University:
Robert_Hoffman, fc, Black_Hand, A, 1908
Apr. 13, 1906, © 118813