The philanthropist and businessman began collecting works with his wife Marlene in the 1970s

Lifelong activist was “one of the truly radical artists of the 20th century”, says Hans Ulrich Obrist

He was able to focus on the rare and the unique, and this was something the others learned from

Artist's colourful nude photographs have been widely shown across Asia, Europe and the US

The sculptor was known for his use of lowly materials like coal, jute bags and piles of stones

When he saw an object he liked, he would never let it go. Sometimes he waited years to acquire some of them

Tate Modern’s show in 2013 brought her abstract sculptures and paintings to a much wider audience

Princess Margaret's former husband worked for Vogue and his pictures were shown at the National Portrait Gallery

Art critic, who hated being called an art critic, will be best remembered for influential television series turned bestseller<br>

Together with his wife Monique Mueller, the Swiss collector built one of the largest private holdings of Pre-Columbian, African and Oceanic objects in Europe

Satirical material was visited upon him and he responded with more thought to entertaining his audience than to doing justice to his achievements

Art historian, independent curator and lecturer, he wrote eruditely and amusingly about museums

Fo spent his life whipping up jolly storms, claiming “freedom of opinion and happiness of existence through rage and laughter”

Painter who created “face landscapes” has works in major public collections around the world

He was closely involved in noble houses’ restitution claims after German reunification

Emirati who created constructivist drawings and performance pieces in the desert was “probably the greatest artist from the UAE”<br>

The photographer did not believe photography could change the world—but it could reveal its changes

The philanthropist couple, who escaped the Nazis in Poland, enriched Montreal’s Museum of Fine Arts

Many of the works owned by Gerald Grosvenor, who has died aged 64, have been loaned over the years to a small museum near the family seat in Chester <br>

Although the Soviet leader once called his work “degenerate”, the artist was asked to design his tombstone

The late Iranian artist considered “still pictures” the perfect, poetic counterpart to moving images

The independent-minded philanthropist whose life was touched by tragedy

Known for his surreal sculptures and performances, he was the first contemporary artist to exhibit work at the Louvre