Thomas F. Scott was a local photographer who operated out of 2704 36th St. NW. His stamp is found on the back of photographs contained in the Garden Archives, indicating that he contributed to the creation of those prints. Very little information is available about Thomas F. Scott other than the stamps on the photographs he printed and basic records available in the 1930 U.S. census, which confirm his profession and place of business.
References:
1930 United States Census (Population Schedule), Washington, Washington, District of Columbia; p. 3A, Line 23, Thomas F. Scott household; digital images, Ancestry.com (http://ancestry.com, accessed August 6, 2014); citing NARA microfilm publication T626, roll 296.
Dumbarton Oaks Garden Archives, GP 42-75, Dumbarton Oaks Research Library, Rare Book Collection. Dumbarton Oaks, Trustees for Harvard University, Washington, D.C.