https://broadway.cas.sc.edu/content/edward-c-dana
To the reply for Poly institute only being in New York: here is a cited quote from the above site about photographers from the late 19th century :
Dana was particularly fortunate in securing the services of George A. Connor as his head printer. Dana collaborated with Connor in experimenting with printing processes, inventing a form of carbonette negative (collodion paper squeezed onto ground glass) and then Ivorette print, a brilliantly clear portrait printed on half-gloss cream cards. The broad notice Dana received from his placements in newspapers and magazines enabled him to undertake expansion in the 1890s. He opened branches in Pittsburgh and Brooklyn (run by operator George P. Roberts) and was in the midst of another relocation of his headquarters up Broadway when he died at age 44. His chief assistant at the time of his death was J.E. Giffin.