Introduction to Fractional and Pseudo Differential Equations with Singular Symbols The book systematically presents the theories of pseudo differential operators with symbols singular in dual variables fractional order derivatives distributed and variable order fractional derivatives random walk approximants and applications of these theories to various initial and multi point boundary value problems for pseudo differential equations. Fractional Fokker Planck Kolmogorov equations associated with a large class of stochastic processes are presented. A complex version of the theory of pseudo differential operators with meromorphic symbols based on the recently introduced complex Fourier transform is developed and applied for initial and boundary value problems for systems of complex differential and pseudo differential equations