This is my mother's paternal grandfather, Henry Robert Clark, 1854-1938. The photo was taken about 1918-1920.
Henry was a schoolmaster at Sidcot Quaker School in Somerset for about 40 years.
This is my mother's maternal grandfather, Edwin Maynard, 1837-1921. The photo was taken about the same time as the one of Henry, above.
Edwin worked in his father's grocer's shop at Whittlesford in Cambridgeshire until the mid-1870s. After this he moved to London for a while before settling in Twickenham where he became the librarian at the newly formed public library. My gran (his daughter) always described him as the "Chief Librarian", but he was actually the only one!!