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"&lt;img alt=\"0917_Dr-Gwen-Korovin_tmz_facebook_sub\" src=\"http://ll-media.tmz.com/2014/09/18/0917-dr-gwen-korovin-tmz-facebook-sub-2.jpg\" /&gt;&lt;br /&gt;&lt;strong&gt;Joan Rivers&lt;/strong&gt;' personal doctor who was working on Joan when &lt;a href=\"http://www.tmz.com/2014/09/04/joan-rivers-dead-dies-throat-surgery/\"&gt;&lt;strong&gt;she stopped breathing&lt;/strong&gt;&lt;/a&gt; is &lt;strong&gt;Dr. Gwen Korovin&lt;/strong&gt;, who treats the biggest celebs in the world ... multiple sources tell TMZ.&lt;br /&gt;&lt;br /&gt;We're told Dr. Korovin was not authorized to practice medicine at Yorkville Endoscopy center. CNN has reported Joan's personal physician &lt;a href=\"http://www.tmz.com/2014/09/17/joan-rivers-dead-selfie-doctor-biopsy-anesthesia/\"&gt;&lt;strong&gt;took a selfie&lt;/strong&gt;&lt;/a&gt; while performing a biopsy on the comedienne.&lt;br /&gt;&lt;br /&gt;Dr. Korovin's patient list reads like a celeb who's who. Her patients include &lt;strong&gt;Celine Dion&lt;/strong&gt;, &lt;strong&gt;Lady Gaga&lt;/strong&gt;, &lt;strong&gt;Hugh Jackman&lt;/strong&gt;, &lt;strong&gt;John Mayer&lt;/strong&gt;, and&amp;#160;&lt;strong&gt;Brooke Shields&lt;/strong&gt;.&lt;br /&gt;&lt;br /&gt;Dr. Korovin's Facebook page has a pic of the doc in her office with pics of her celeb patients lining the walls.&lt;br /&gt;&lt;br /&gt;&lt;img alt=\"0917_Dr-Gwen-Korovin_facebook\" src=\"http://ll-media.tmz.com/2014/09/18/0917-dr-gwen-korovin-facebook-2.jpg\" /&gt;&lt;br /&gt;The doctor has done interviews in which she says she brings a black bag to the dressing rooms of A-list stars and administers \"on-the-spot treatment.\"&lt;br /&gt;&lt;br /&gt;We reached out to Doctor Korovin's office and were told, \"We do not comment on matters related to patients.\""^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.tmz.com/2014/09/17/joan-rivers-doctor-death-throat-surgery-gwen-korovin/>