Mikołaj Henryk Górecki was one of the greatest composers of our time. He certainly was famous on the worldwide scene for his „Symphony of Sorrowful Songs” that was a global hit comparable only to popular music hits. But all his works, including those commissioned by Kronos Quartet place him among the giants of music like Olivier Messiaen, Charles Ives, Arvo Part, John Taverner or Giya Kancheli. He practiced something I call, by the term I coined: „rich minimalism” — where the musical language is simple but the meanings and depths are rich.
If you haven't heard about Górecki, it is also for the fact that he was very modest and private person who always shunned publicity.
Here is the Górecki's obituary published by Guardian.