Who Is this guy Bob Ezrin That Kanye Is Beefing With?

Bob Ezrin works as a record producer, mix engineer, arranger and songwriter, in addition to being involved with a variety of other projects in digital media, live production, film, television, and theatrical production. Ezrin has worked on recordings with numerous major artists, including Phish, Alice Cooper, Kiss, Pink Floyd, Lou Reed, The Kings, Hanoi Rocks, Taylor Swift, Peter Gabriel, K'naan, 2Cellos, Kristin Chenoweth, Rod Stewart, Nine Inch Nails, The Jayhawks, Thirty Seconds to Mars, The Darkness, Jane's Addiction, Dr. John, Nils Lofgren, Berlin, Kansas, Julian Lennon, and Deftones, among many others. via Wiki