Please answer the following question: Pick one category for the following text. The options are - company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work. Daniel Davis Jr. -  Daniel Davis Jr. (1813–1887) was an American photographer daguerreotypist and ambrotypist.In 1842 Daniel Davis Jr. patented a method for colouring daguerreotypes through electroplating and his work was refined by Warren Thompson the following year.
A:
Artist