Before becoming a full time chessplayer he was a journalist. His most famous work was his book on the 1972 Fischer v Spassky World Chamionship match, which was the first chess book I ever read. He was an active player up until 2003, and in his (chess) retirement, developed an interest in music.
A full description of his life and achievements can be found in the Chessvibes article.
While looking for a suitable game to show of his, I came across this one from Lone Pine, against sometime Australian player David Parr (brother of Peter). It was all the more interesting as Parr decided to play the Kings Indian Defence, an opening closely associated with Gligoric. Clearly the choice of opening did not ruffle Gligoric, as he scored a nice win, finishing the game off with a piece sacrifice.
Gligoric,Svetozar (2575) - Parr,David (2200) [E82]
Lone Pine op Lone Pine (4), 1975