“In light of a concerted lobbying campaign against my husband’s recent investment, I have taken the decision to step down as CEO of the Serpentine Galleries.
"I am saddened to find myself in this position. I have dedicated the majority of my professional life to public service in the cultural sector.
"I am proud of all that has been achieved for art and artists in my roles as co-founder of Outset, chair of Para Site Art Space and supporter of many arts institutions in London.
“The work of the Serpentine — and its incomparable artistic director [Hans Ulrich Obrist] — cannot be allowed to be undermined by misguided personal attacks on me and my family.”
She added: “A word for the wonderful community of artist and supporters, with whom I will continue to engage.
"The world of art is about free expression. But it is not about bullying and intimidation. I welcome debate and discussion about the realities of life in the digital age. There is a place for these debates, but they should be constructive, fair and factual – not based upon toxic personal attacks.”