Willis D. Gates and George F. Gates (who also worked separately) were prolific in the production of stereoviews for nearly thirty years; starting during the late 1860’s and continuing into the 1890’s. Their most common views were issued exclusively from Chicago from 1885-1887. In their earlier years they worked out of Watkins Glen, New York. Their total production numbers include over 3000 varied views of United States scenery, including extensive coverage of New York State, Chicago and Washington D.C. Some of their views include the caption: "Sold by Jno. S. Stott (probably of Emerson & Stott fame) 224 State Street." It is not clear if the Illinois and New York companies were the same, or if different partnerships were involved.

A pirate company, the Gates Brothers did not photograph the Yellowstone country themselves, but rather used photos (legally or illegally is not known) of other noted Yellowstone photographers. At least 4 styles of Yellowstone views are known to have been produced by them. Some include the caption "Gates Brothers," while others are simply credited to "Gates." This variation would seem to indicate 4 different series by the company that include Yellowstone views. So although their known Yellowstone viewlist is currently small, it is probable that others were produced and will turn up in the future.

2 Hot Springs, Yellowstone Park, Wyoming.

2000-Gardiner River Falls, middle fork, Yellowstone Park.

Sentinel Rocks, Yellowstone Park.

Deer Hunting, Wyoming.