I just finished reading Marcia Tucker's memoir, A Short Life of Trouble, Forty Years in the New York Art World. Here is a quote from the letter she wrote to the museum's trustees after her firing from the Whitney Museum.

As a scholar, it has always been my conviction that it is the museum's responsibility not only to reflect the consensus of educated opinion by which art history is made, but also to seek out the best work at its source, rather than only after it has achieved commercial exposure.