In this task, you're expected to write answers to questions involving multiple references to the same entity. The answer to the question should be unambiguous and a phrase in the paragraph. Most questions can have only one correct answer.

Passage: The painting was included in Lichtenstein's first solo exhibition at The Leo Castelli Gallery, a show in which all the works had pre-sold before its opening in February 1962. The exhibition, which ran from February 10 through March 3, 1962, included Engagement Ring, Blam and The Refrigerator. He included the painting in his Artist's StudioLook Mickey (1973), showing it hanging prominently on the wall of the pictorial space intended to depict his studio as the ideal studio, and implying that his popularity with critic and public ratifies his choice of popular culture subject matter. Reflecting on Look Mickey many years later, he said:
The idea of doing [a cartoon painting] without apparent alteration just occurred to me ... and I did one really almost half seriously to get an idea of what it might look like. And as I was painting this painting I kind of got interested in organizing it as a painting and brought it to some kind of conclusion as an aesthetic statement, which I hadn't really intended to do to begin with. And then I really went back to my other kind of painting, which was pretty abstract. Or tried to. But I had this cartoon painting in my studio, and it was a little too formidable. I couldn't keep my eyes off it, and it sort of prevented me from painting in any other way, and then I decided this stuff was really serious ... I would say I had it on my easel for a week. I would just want to see what it looked like. I tried to make it a work of art. I wasn't trying just to copy. I realized that this was just so much more compelling.
The painting was bequeathed to the Washington National Gallery of Art after Lichtenstein's death in 1997, following a 1990 pledge in honor of the institution's 50th Anniversary. It remains in the gallery's collection, where, as of November 2012, it is on permanent view.Harold Rosenberg once described Lichtensteins reworking of the comics source as follows: "...the difference between a comic strip of Mickey Mouse and a Lichtenstein painting of the same was art history, or the fact that Lichtenstein paints with the idea of the museum in mind.".
Question: What is the last name of the person that said that the man who painted Look Mickey as someone who "...paints with the idea of the museum in mind."?
Rosenberg.