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According to Wikipedia:

El Greco (Spanish for "the Greek") is the name by which Domenikos Theotokopoulos (1541 - April 7, 1614), a Cretan-born painter and sculptor, is best known.

He was a master painter in Crete; he journeyed to Rome where he studied under Titian. In 1577 he emigrated to Toledo, Spain, where he produced his mature works. Many of El Greco's works are on display at the Museo del Prado.

El Greco was born on the island of Crete and first trained as an icon painter. At the age of 26, wishing to widen his artistic horizons, he travelled to Venice and Rome, before settling in Toledo, at the time the ecclesiastical capital of Spain. There, he led a successful career as a painter of altarpieces and portraits.

Holy Trinity, 1577 (Museo del Prado, Madrid)After his death, El Greco's work fell into relative obscurity. It was not until the late 19th century that artists and critics renewed interest in his highly individual manner of expression. El Greco's liberation of form, light and colour inspired artists such as Pablo Picasso and Jackson Pollock in their efforts to transform the art of painting of the 20th century.

According to the National Gallery of Art:

El Greco was a Greek-born artist whose emotional style vividly expressed the passion of Counter-Reformation Spain. Here at the National Gallery is the most important collection of his work outside that country, which was his adopted home. The haunting intensity of El Greco's paintings -- resulting from their unnaturally long figures and strong contrasts of color and light -- has invited a kind of mythmaking about his life and art. Following his death, El Greco's work fell into obscurity and, after its rediscovery in the last century, was often misunderstood. El Greco has been called a prophet of modern art, a mystic, and even a man whose sight was distorted by astigmatism, all misconceptions that have clouded understanding of his distinctive but deliberate style. Continue