Control of Fluid Flow Control of Weak and Strong Reverse Flow Regions in Incompressible Turbulent Boundary Layers Aerodynamic Flow Control Using Synthetic Jet Actuators Control of Mixing and Reactive Flow Processes Nonlinear Modeling and Control of Combustion Dynamics Control of Acoustics Distributed Control and Observation Global Boundary Stabilization of 2D Poiseuille Flow Exact Controllability and Feedback Stabilization from a Boundary for the Navier Stokes Equations Vortex based Control Algorithms Flow Optimization Using Stochastic Algorithms. Flow Control and Optimization is increasingly incorporated in the design of engineering devices ranging from aircraft and space vehicles to microuidic devices. Research in this eld aims to integrate knowledge in ow physics with theoretical advances and novel experimental capabilities and engineering devices capable of materializing advanced design concepts. In turn controlled ow phenomena exhibit a new arrays of physics and open frontiers for further interdisciplinary research in uid mechanics and all the engineering domains that it aects. This collection of papers in ow control showcases representatives lines of work in the area of ow control demonstrating the interdisciplinary character and high scientic merit of this eld. The authors of these articles are among the pioneering researchers in this eld and continue to explore the frontiers in ow control and optimization. We hope that this volume while largely representing work by the authors prior to 2004 contributes in providing an authoritative report on this rapidly changing eld.