This is a collection of contributed papers by many eminent Harmonic Analysts and specialists of Partial Differential equations. The papers focus on weighted norm equalities for singular integrals, focusing wave equations, degenerate elliptic equations, Navier-Stokes flow in two dimensions and Poincare-Sobolev inequalities in the setting of metric spaces equipped with measures among others. Many topics considered in this volume stem from the interests of Richard L. Wheeden whose contributions to Potential Theory, singular integral theory and degenerate elliptic PDE theory this volume honors. Luis Caffarelli, Sagun Chanillo, Bruno Franchi, Cristian Guttierez, Xiaojun Huang, Carlos Kenig, Ermanno Lanconelli, Eric Sawyer and Alexander Volberg, are some of the many contributors to this volume. 

This book will be a collection of articles and surveys written by a very distinguished group of Mathematicians on an important field with far reaching consequences in other areas of Mathematics This volume will consist of articles that have connections to the work of Richard Wheeden who has made profound contributions to Fourier Analysis, and related applications to Partial Differential Equations This work is centered around the research interests of Richard L. Wheeden