Season 113 - Day 11 of 14

The Spanish painter Diego Velazquez was the leading artist in the court of King Philip IV and of the Spanish Golden Age.
Several notable twentieth century artists, including Pablo Picasso and Salvador Dalí, held Velazquez in such high regard that they recreated some of his paintings.
An Anglo-Irish painter found Velazquez' portrait of Pope Innocent X so encaptivating that he, in the 1950s, created a series of expressionist variations of this piece often referred to as the Screaming Popes.
Which artist created such gruesome versions of the innocent pope?