Thomas E. Marr and Son

see Ron Polito "T.E. Marr (& Son): Isabella Stewart Gardner's Photographers--And More," New England Journal of Photographic History (Waltham, 2020).

Thomas E. Marr and his son Arthur Marr

Started using Thomas E. Marr & Son in 1910 and after Thomas's death, Arthur formally changed the name of the business to T.E. Marr & Son in 1910

everything before 1910 probably by Thomas. Everything after by Arthur

Last business listing for the firm appears in 1942.