O.G.R.: Photography as the handmaid of art, Brit.J.Photographic Almanac & Photographer's Daily 1866:92-94; www.photography-now.com/artists/28354.html
Bill Jay: Photography of facial expression, in: Brit. J. Photogr. 7 Nov. 1980 ; P. Prodger: Darwin's Camera (Oxford 2009) ; Prodger 1998: 145 & 170ff. ; D. Elliott (ed.): E. G. R. (1993) ; E. Y. Jones: Father of Art Photography (1973) ; P. C. Bunnell (ed.): Photography of O. G. R. Selections ; J. Smith: C. Darwin & Victorian Visual Culture (2011) ; Kemp 2006: 290-291 ;
Born in Sweden, first settled in Lincoln, then Wolverhampton(1846), later opened a photographic studio in London (1850s), since 1862 in Malden Road, London.