American art goes beyond the US border

For great American art, come to London this week. As well as the Abstract Expressionism show at the Royal Academy of Arts (until 2 January 2017) and Georgia OKeeffe at Tate Modern (until 30 October), there are installations by Mike Kelley at Hauser & Wirth and Bruce Nauman at Blain Southern, while Ed Ruschas new paintings are at Gagosian Gallerys Grosvenor Hill space. Head to Frieze Masters for a monographic display of works by Ruscha at Gagosian and a Frank Stella survey at the shared stan