Who was J. W. B. Garrett, whom Augusta Browne married in September 1855, within weeks of first meeting him?

J. W. B. (John Walter Benjamin) Garrett was an artist who specialized in portraits, especially paintings made from small daguerreotypes, just as families today can commission a portrait to be painted from a photograph. Garrett had not trained as an artist and turned to painting around 1850, after chasing journalism and politics as a young man. John (J. W. B.) did not hail from New York. He arrived in Gotham during the summer of 1855, after traveling from Memphis, Tennessee, where he had recently lived and maintained a portrait studio.