Rachel Whiteread CBE is one of Britain's foremost contemporary artists. She is known for producing casts of 'negative space' - the area where the space within a particular container would be. Famous examples include 1990's 'Ghost', 1993's 'House', and a resin sculpture for the empty plinth in Trafalgar Square.
Whilst her work has achieved a degree of notoriety - particularly when Tower Hamlets council demolished 'House' in 1994 - Whiteread herself is fairly uncomfortable about controversy.
Her work is monumental - both in terms of scale and in the sense of a monument as something that always already represents a mourning for something lost or absent. 2000's 'Judenplatz Holocaust Memorial' in Vienna is an incredible work: bleak and brutal, but somehow also sensitive and suggestive of hope.