Erika and Rolf Hoffmann open their collection in Berlin

Director Cristina Aschengreen-Piacenti has pioneered the project, refusing to allow the residence of a great Anglo-Florentine collector to fade from memory

Collectors came out in force, but much of the art on show was not as exciting as that seen at Venice or offered by the auction houses

Centenary of collector, C.D.E. Fortnum, celebrated with exhibition and lectures at Society of Antiquaries

This blockbuster biography records the life of the American financier in exhaustive and exhausting detail, but fails to tell the story of his collecting

Similar in many ways, the subjects of these two biographies present contrasting styles of operation in the art market

Dealers come to share in the benefits of no income tax whatsoever

Is the gift an act of virtuous self-regard?

The former Cologne art dealer has given, lent, and sold parts of his collection to Weimar, in eastern Germany

This biography of Henry Clay Frick takes a psychological approach that leaves much to be desired

The man behind the Mitchell Prize, awarded last month, is also a major collector of Pre-Columbian gold sculpture

Catherine E. King's book reviewed

Will public art by Koons, Rauschenberg, Tinguely and Haring humanise this vast complex by Renzo Piano?

The story of the Regency dilettante, eccentric and collector is told in all its scandalous detail

Over twenty-five years this Anglo-American has built up a great library of early books, manuscripts and incunabula

Computer-glitch software, Norton Utilities, has made the fortunes of Peter and Eileen Norton

“Lucian Freud: Some New Paintings” is on show until 26 July

The recent, widely publicised dispute over the provenance of two paintings by Egon Schiele, withdrawn last year from a loan exhibition at New York’s Museum of Modern Art on the grounds of contested ownership, offered a vivid illustration of the problems facing museums and private collectors who may find themselves having to prove good title to their possessions

Magnificent Man Rays turn out to be too good to be true, throwing doubt over other collections of his work

Unsurprisingly, most of these collections strongly represent the art of their own country

Golf is the new passion of millionaire who has sold Impressionists and French decorative art to the tune of $91.48 million since 1989

Former mutual-fund manager pits his taste against the market

Museums and collectors should hasten to protect their rights in this field

Inspired by the Tate’s plans for Bankside, she gave the museum one third of her massive collection of modern art

The donation will strengthen the museum’s holdings with major paintings by Americans such as Philip Guston, Leon Golub, Richard Diebenkorn and Willem de Kooning

The old favourites - Italian views and Dutch landscapes - make record-breaking totals

A round-up of some recent books on porcelain, pottery and delftware

Photographer and film director Yonfan has given eight Chinese paintings to the Musée Guimet in Paris

100 to be sold, including Thomas Cromwell from the studio of Hans Holbein