Dorothy: The only entry I have for him is this listing in an Evansville city directory:

1870-71 Williams' Evansville Directory, p. 233 Stewart & Co. (E. J. Stewart & B. H. Robinson), photographers, 8 N. 2d bet. Main & Sycamore; E. J. Stewart, h N side Canal, bet. 5th Ave. & 6th ave., Lamasco

So it appears that he was a partner in a photo studio. I've not checked all of the Evansville directories, so he possibly worked there longer.

Could you provide some biographical information? I'd like to know this about all photographers in Indiana:
1. Birth and Death dates and places
2. Names of parents, spouses, and children
3. Other occupations
4. Years involved in photography
5. Specific locations of studios (addresses, cities, and names of galleries)
6. Education
7. Other biographical information, especially about their photography careers
8. SOURCES!

Thanks,

Joan Hostetler
Indiana Photographers Project
716 N. Dorman St.
Indianapolis, IN 46202
(317) 639-2814
heritagephoto@indy.rr.com