The first photo is of George Norbury Mackenzie I, 11 February 1824 - 31 January 1887.
From what I could find on this gentleman on Ancestry.com, he was born in Maryland, son of Thomas Mackenzie and Tacy Burges Norbury.
This is his wife, Martha Anna Downing Mackenzie (7 April 1827 - 16 Dec 1894), daughter of Howell Downing and Harriet Gorsuch:
This is their son, George Norbury Mackenzie II (4 May 1851 - 11 February 1919):
George Norbury Mackenzie II was author of Colonial families of the United States of America, in which is given the history, genealogy and armorial bearings of colonial families who settled in the American colonies from the time of the settlement of Jamestown, 13th May, 1607, to the battle of Lexington, 19th April, 1775 (seriously, could the title be any longer?). So he was evidently interested in family history himself.
The last Mackenzie photo I found in the bin was that of George Norbury Mackenzie III (2 April 1875 - 7 June 1928):
I would be happy to share these photos with any Mackenzie descendants or relatives who are interested.