In light of former Artforum publisher Knight Landesman's resignation amid allegations of sexual misconduct, 2,000 art world professionals including artists, gallerists, writers, curators and editors have signed a letter (published on not-surprised.org) condemning abuse in the international art world. Prominent signatories include artists Cindy Sherman, Ann Hirsch, Jenny Holzer, Barbara Kruger and Collier Schorr, curators Bennett Simpson…