The man on the right is the Rev. John Riddle Warner. He was the grandfather of the poet Marianne Moore and during the Civil War, he lived in Gettysburg, Pennsylvania. The man at the left is probably his brother, Henry Warner. The photograph is undated, but the ages of the sitters suggest late 1850s or early 1860s. Warner family letters will feature later on in Today in the Civil War.
Citation: Unknown photographer, daguerreotype of Henry Warner(?) and John Riddle Warner. 2006.7637
And today is apparently Marianne Moore’s birthday. Neat!
Good on you for finding the connection. That was my sneaky reason for choosing today to post this particular photo.