This man's paper  
This mathematician conducted a study in which he found that  nancial markets' price  uctuations were governed by Lévy stable distributions. This man declared  Clouds are not spheres, mountains are not cones, coastlines are not circles  in a book explaining his theory of  roughness . This man's paper  How Long is the   Coast of Britain? Statistical Self-Similarity and Fractional Dimension  discusses self-similar curves, and in 1975 this man coined the term  fractal  to describe such shapes. For ten points, identify this mathematician who names a set of complex numbers with fractal properties.
This mathematician conducted a study in which he found that  nancial markets' price  uctuations were governed by Lévy stable distributions.
Benoit B. Mandelbrot