Born in Lima, Peru, Boris attended the National School of Fine Arts in his native country before immigrating to the United States in 1964. He has since done a great volume of work for the Fantasy field, having worked for virtually every major publishing house with a science fiction/fantasy line.

Boris has also illustrated for album covers, video box art and motion picture advertising. His mastery of oil painting is immediately and abundantly clear to anyone who looks at his work, and his classic sense is as much an homage to the old masters as it is to anyone contemporaneously working in the Fantasy genre.