He was a minister who retired in his early 40's because of ill health. He had two hobbies, photography and bicycling. He combined the two, taking many photographs of the New England countryside. He hand colored them to make them more interesting using oil paints, solvents, small brushes and solvents. They became so popular at his peak he had 200 "colorists" working for him.
I used his method to do some hand colored photos on my own. It is a long time consuming process but the end result can be really special.
This is one of my favorites. If you zoom in you can see where the color is applied.
Below is Sunset in Rockport NFS
5x7 photo in museum quality 8x10 mat