This book celebrates Professor Thanos Antoulas's 70th birthday, marking his fundamental contributions to systems and control theory, especially model reduction and, more recently, data-driven modeling and system identification. Model reduction is a prominent research topic with wide ranging scientific and engineering applications. 

Christopher Beattie is Professor of Mathematics at Virginia Polytechnic Institute and State University. His areas of specialization are model reduction, computational linear algebra, spectral/eigenvalue estimation, numerical analysis, and scientific computing.

Peter Benner is Director and Scientific Member of the Max Planck Institute for Dynamics of Complex Technical Systems in Magdeburg, a Professor for Mathematics in Industry and Technology at TU Chemnitz, and Honorary Professor at the Department of Mathematics, Otto-von-Guericke University, Magdeburg. His research areas include model reduction, systems and control theory, numerical linear and multilinear algebra, PDE-constrained optimization, and uncertainty quantification.

Mark Embree is Professor of Mathematics at Virginia Polytechnic Institute and State University. With Nick Trefethen, he is co-author of Spectra and Pseudospectra: The Behavior of Nonnormal Matrices and Operators. His research interests include computational linear algebra and spectral perturbation theory.

Serkan Gugercin is Professor of Mathematics at Virginia Polytechnic Institute and State University. His research interests are model reduction, systems and control theory, data-driven modeling, and numerical analysis.