(1824-1874) He learned the daguerreotype process in 1846, and opened a studio in 1850 in St. Johnsbury, Vermont, and operated it until his death in 1874.
In 1856 he advertised the largest establishment in the state of Vermont, and offered daguerreotypes, ambrotypes, and mezzotint STATUTYPES. He also offered instruction in the process, and had stock for sale. In 1857, in an advertisement unidentified by name, a daguerreian advertised at #6 Main St., St. Johnsbury. "Incomparably beautiful ambrotypes, photographs and daguerreotypes, taken by the man with the long flowing beard." From a later description of him, this was undoubtedly Gage.
In 1858, he was listed in business over Hall & Higgins store, in partnership as Gage and Rowell. In 1860, he was listed in business as the St. Johnsbury Portrait Gallery, and also offered Gage's stereo views of the White Mountains. He also offered the "Ebonytype".
Humphrey's Journal in 1860 described Gage as being a man of about 35, with black boots, a wide-brimmed hat, hands stained profusely with silver nitrate, and a long flowing beard that came to his waist. In the same year, Gage wrote profusely for Humphrey's Journal of his photographic trips to the White Mountains. He noted he was assisted by an "Anderson" from Pennsylvania. Anderson was described as an amateur photographer who traveled with Gage "for his own amusement" and assisted him.
In 1869 Gage patented a process for using diffused light in the camera. On another occasion, he patented an improvement in camera apparatus.