Sid Richardson began collecting the works of Frederic Remington and Charles Russell with the help of Newhouse Galleries of New York City. Newhouse became Richardson's principal dealer and helped him acquire the majority of his paintings. Oilmen like Richardson, Amon Carter, Thomas Gilcrease, Frank Phillips and R.W. Norton, themselves part of the western legend of freewheeling enterprise, established through their collections a link to the romantic legends of the Old West.
Sid Richardson did not limit his collection to Remington and Russell. While he showed no interest in Western landscapists or the pre-Civil War documentarians he did acquire works by such relatively unknown late nineteenth-century artists as Gilbert Gaul, Peter Moran, and Charles F. Browne. He had a preference for paintings with action or suspense and collected such works by Charles Schreyvogel, Oscar E. Berninghaus, Frank Tenney Johnson, William R. Leigh and Edwin W. Deming. (These works are currently on display in the museum.) But his primary interest was in Remington and Russell, adding an occasional work to his collection until a few years before his death on September 30, 1959. Time has confirmed his wisdom. Remington and Russell remain today what they were in their own day, the "titans of Western art."