As the auction house celebrates a milestone anniversary, its global president reflects on what's in store for the future

Three highlights going under the hammer in the Defining British Art sale in London on 30 June

Warning that the world’s most stringent trade rules could see dealers moving abroad

Political uncertainty and last-minute withdrawals may have contributed to below-estimate results

Ahead of Brexit vote, auction house’s Impressionist and Modern Art evening sale achieves solid results

Visitors and participants may be spared having to choose between the two events

First recipient, Middlesbrough Institute of Modern Art, to spend £50,000 on work addressing migration crisis

New technology allows collectors to take part in sales in real time

Her annual global market report, now sponsored by the Swiss fair and UBS, will be published to coincide with next year’s Hong Kong edition

Our pick of highlights coming to auction this week

The combined total is a new low, but there are (small) reasons to hope

This year’s fair will reflect the art world’s growing appreciation of photography

Our pick of this week’s international auctions

The dealer and author Richard Polsky explains why he is brave enough to authenticate works by Haring and Basquiat

Solo stand of works—and cars—by Salvatore Scarpitta is generating new interest in the US artist’s work

Auction houses in Berlin, Cologne and Munich offer a restituted Menzel, Brücke artists and a Richter

The fair’s takeover heralds a likely expansion in the number of exhibitors

Instagram-friendly works can give a huge publicity boost to artists and exhibitions

A new book on the history of private collectors describes how Emma Hamilton became inextricable from her husband’s often erotic collection of ancient art

Visitors can compare and contrast the Art021 and West Bund contemporary fairs in November