Both artists implied that their desire was to find a mechanism that communicates on behalf of the artist by removing traces of personal taste. (bombmagazine.org)
All of the people you mentioned have «handlers» or social media experts that post and respond to things on behalf of the artist. (goodereader.com)
Purchased from the artist by Sir Michael Sadler, 1933; bt from his estate through the Leicester Galleries by Mark Harvey, 1944, from whom bt by Gimpel Fils on behalf of the artist April 1970 (tate.org.uk)