Given the task definition and input, reply with output. In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.

Passage: In Waters' absence, Gilmour had been recruiting musicians for a new project. Months previously, keyboardist Jon Carin had jammed with Gilmour at his Hookend studio, where he composed the chord progression that became "Learning to Fly", and so was invited onto the team. Gilmour invited Bob Ezrin (co-producer of 1979's The Wall) to help consolidate their material; Ezrin had turned down Waters' offer of a role on the development of his new solo album, Radio K.A.O.S., saying it was "far easier for Dave and I to do our version of a Floyd record". Ezrin arrived in England in mid-1986 for what Gilmour later described as "mucking about with a lot of demos".At this stage, there was no commitment to a new Pink Floyd release, and Gilmour maintained that the material might become his third solo album. CBS representative Stephen Ralbovsky hoped for a new Pink Floyd album, but in a meeting in November 1986, told Gilmour and Ezrin that the music "doesn't sound a fucking thing like Pink Floyd". Gilmour later said that the new project was difficult without Waters. He experimented with songwriters such as Eric Stewart and Roger McGough, but eventually settled on Anthony Moore, who was credited as co-writer of "Learning to Fly" and "On the Turning Away". Whereas many prior Pink Floyd albums are concept albums, Gilmour settled for the more conventional approach of a collection of songs without a thematic link. By the end of that year, he had decided to make the material into a Pink Floyd project.
What is the first name of the person who had turned down Waters' offer of a role on the development of his new solo album?