Moses Billings
With the development of the daguerreotype in the 1840s, the role of the portrait painter declined in general, because it was now much easier and much cheaper to have one's likeness presented in a visual format. While many portrait painters lost business in competition with the daguerreotype, Billings instead began to produce daguerreotype prints himself. It is not known exactly which prints were made by Moses Billings, as daguerreotypes were usually signed, when signed at all, along the side of the plate. Due to the traditional storing methods of daguerreotype plates, even this signature usually quickly became illegible. However, it has been generally noted, or at least hypothesized, that his daguerreotype prints showed a level of talent and artistry above that of amateur daguerreotypists. Though it is not known exactly which prints were his, it is known that he had largely abandoned the process by the 1850s. Even after he stopped making daguerreotypes, he did continue to paint people's portraits on canvas.
Abraham Bogardus
Abraham Bogardus (November 29, 1822 – March 22, 1908) was an American Daguerreotypist and photographer who made some 200,000 daguerreotypes during his career. 
He was trained in the Daguerreotype process by New Yorker George W. Prosch, who in 1839 had made a camera for Samuel F.B. Morse. Bogardus opened a studio and gallery at 363 Broadway in New York in 1846, becoming very successful. In 1868, he helped in the founding of the National Photographic Association of which he was President for five years. He worked as a clerk in a dry goods store in the late 1830s, and exhibited a painting at the American Institute in 1845.
From 1847 to 1852, he was listed as a Daguerreotypist at 217 Greenwich Street. His residence was in Newark, N.J. from 1849 to 1851, returning to Grove Street, New York City between 1851 and 1852. His success enabled a branch gallery at 126 Washington Street, Newark, N.J. in 1849, which moved to 8 Clinton Street, Newark, N.J. in 1850. His New York City gallery was moved to 229 Greenwich Street in 1851 and the old Root Gallery at 363 Broadway refitted in 1862. He opened a new studio at 1153 Broadway in 1869, maintaining the 363 Broadway address.