Ciruelo was born in Buenos Aires, Argentina, in 1963. After finishing the secondary school he started working in an advertising agency as an illustrator. At 21 he became a freelance artist and two years later, in 1987, he moved to Spain searching for fantasy art publishers. Since then, he has been working for prominent publishers in Europe and in the United States, creating fantasy art for book covers, prints and calendars, with dragons as the main subject. Among other important works, he did book covers for the trilogy written by George Lucas Chronicles of the Shadow War, album covers for guitarist Steve Vai, and cards for Magic the Gathering. Recently, he illustrated the cover for the new edition of Eragon. Ciruelo is always drawing, painting and writing with the idea of publishing books, which is his favorite format with nine books published already. Exhibitions of his oil paintings can be seen in different countries along with his Petropictos, which is the art of painting on stones with a technique that he created back in 1995. He lives with his wife and their children in Sitges, a quaint and magical town near Barcelona, on the shores of the Mediterranean Sea.