Wikipedia tells us:
Lucian Michael Freud, 1922 – 2011) was a German-born British painter. Known chiefly for his thickly impastoed portrait and figure paintings, he was widely considered the pre-eminent British artist of his time. His works are noted for their psychological penetration, and for their often discomforting examination of the relationship between artist and model.
And, I might add, for his obsession with--and unflattering portrayals of--nudes in all genders, shapes and sizes.