Dale Miller is currently Director of Research at INRIA-Saclay where he is the Scientific Leader of the Parsifal team. He has been a professor at the University of Pennsylvania, Pennsylvania State University and the École Polytechnique, France. Miller is the Editor-in-Chief of the ACM Transactions on Computational Logic and has editorial duties on several other journals. He was awarded an ERC Advanced Investigators Grant in 2011 and is the recipient of the 2011 Test-of-Time award of the IEEE Symposium on Logic in Computer Science. He works on many topics in the general area of computational logic, including automated reasoning, logic programming, proof theory, unification theory, operational semantics and, most recently, proof certificates. Gopalan Nadathur is Professor of Computer Science at the University of Minnesota. He has previously held faculty appointments at Duke University, the University of Chicago and Loyola University Chicago. Nadathur's research interests span the areas of computational logic, programming languages and logic programming. His work has been regularly funded by the National Science Foundation and has appeared in publications such as the Journal of the Association of Computing Machinery, Information and Computation, Logic and Computation, the Journal of Automated Reasoning and Theory and Practice of Logic Programming.