Art Industry News: Jeff Koons Has Joined MasterClass to Teach His Uniquely Cosmic Perspective on Making Art + Other Stories Plus, the staff at Pittsburgh's Carnegie Museums vote to unionize and the Mapplethorpe Foundation is under scrutiny for taking a PPP loan. Jeff Koons, mid-lesson. Courtesy of MasterClass. Art Industry News is a daily digest of the most consequential developments coming out of the art world and art market. Here’s what you need to know on this Thursday, December 17. NEED-TO-READ Carnegie Museums Staff Vote to Unionize – Employees at Pittsburgh’s Carnegie Museums are the latest in a wave of museum workforces to vote in favor of joining a union. Full-time and part-time staff at the Andy Warhol Museum, Carnegie Science Center, and Carnegie Museums of Art and Natural History voted 278 to 75 to join the United Steelworkers’ 500-member United Museum Workers unit. (