E.C. Kammermayer 
Last updated: 20.02.17
All that can presently (October 2015) be gleaned about by internet searching is that E.C. Kammermayer is the one-off composer of Chewin' the Rag (1900) published by E. C. Kammermayer, Los Angeles, California, USA.
Surfers are welcome to contribute information about this composer.