A sharp mind, a warm personality and a dynamic director

After heading museums in Britain and Germany, he became more politically engaged

Ilya Glazunov gained the backing of all Russia’s presidents from Khrushchev onwards

Williams led the creation of the Getty Center and grew the institution’s endowment

Dissident activist and Nobel laureate was last sentenced to 11 years in prison in 2009 and died in custody

His work is currently on show in Soul of a Nation at Tate Modern

Artist Nicola Green, gallery director Ingrid Swenson and Tate curator Andrew Wilson share their memories

Photographer’s works praised at this year's Venice Biennale and a print is due to be displayed at Tate Britain as a tribute

He sat under a floor at a gallery with a microphone for eight hours and masturbated while speaking of his fantasies about people sitting above

Rosenquist put the mass consciousness of fear and cultural contradiction in a room, outflanking all who entered it

She fought a centuries-old monopoly of the country’s auction market—and won

“Once someone said conceptual art I thought, maybe I can do that, I have ideas, there’s a place for me,” the artist said in an interview

Pop artist, who has died aged 83, told us ahead of his 2003 Guggenheim retrospective about subverting New York billboards as a young man

The many cultural initiatives of Olivetti’s and Fiat’s arts director

The former chairman’s ties to the institution reach back to his mother Abby Aldrich Rockefeller, who helped found the museum

British painter, described as one of the greatest colourists of his generation, won the Turner Prize in 1985 and exhibited widely including at the Met and Reina Sofia

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