Benoit Mandelbrot was a renowned mathematician known for his work in fractal geometry and its applications in science and art. Some synonyms that could be used to refer to him include "fractal pioneer", "mathematical genius", "innovative mathematician", "mathematical visionary", and "groundbreaking researcher". These terms reflect Mandelbrot's achievements and contributions to mathematics, particularly in his development of the theory of fractals, which has had a significant impact across many fields. Mandelbrot's legacy continues to inspire and inform research in mathematics and related areas, and his name remains synonymous with groundbreaking ideas and innovative approaches to problem-solving.