Historically, private collections have been less diverse with regard to the gender of artists and, across all regions and demographic groups, tended to be dominated by works by male artists (an average of 60%). As noted in earlier reports by Art Basel and UBS, this does not necessarily mean that collectors were biased in their selections; rather, they report that, when choosing which works to acquire, they were not influenced by either the background or the gender of the artists exhibited.

John Millei (b. 1958, Los Angeles) is an Associate Professor within the arts faculties of Pasadena, Claremont Graduate University, and the Southern California Institute of Architecture. He is one of the recognised representatives of Californian abstraction that emerged in the 1980s and has participated in numerous museum exhibitions alongside leading artists such as Helen Frankenthaler, Hans Hofmann, and Ernst Wilhelm Nay.