These Proceedings contain papers that were presented at the Fifty-seventh Annual Allerton Conference on Communication, Control, and Computing which was held at Allerton House, Monticello, Illinois, on September 24-27, 2019. As in past years, the Conference was sponsored by the Coordinated Science Laboratory and the Department of Electrical and Computer Engineering of the University of Illinois at Urbana-Champaign.

One hundred six invited papers and one hundred thirty-three contributed papers were presented at the Conference in forty-six sessions. We thank all the authors and particularly the speakers for contributing to the success of the Conference. We are also grateful to our colleagues at the University of Illinois at Urbana-Champaign: C. Beck, S. Bose, E. Chitambar, M. Do, I. Dokmanic, M. El-Kebir, S. R. Etesami, G. Fellouris, B. Hajek, N. He, M. Hernaez, B. Hu, N. Jiang, M. Junge, A. Miller, I. Ochoa, M. Ornik, L. Ren, I. Shomorony, J. Sirignano, R. Srikant, R. Sun, H. Tran, V. Veeravalli, P. Viswanath, and Z. Zhao for organizing the invited sessions, chairing sessions, and helping in many other ways in the smooth running of the Conference.

Additionally, a number of these invited sessions were co-organized with colleagues from other institutions: H. Kim of Samsung AI Research Cambridge, S. ten Brink of University of Stuttgart, Y. Wu of Yale University, and J. Xu of Duke University. We are especially grateful to each of them for their efforts on behalf of the Conference.

The plenary speaker at the Conference was Professor Benjamin Van Roy of Stanford University, who gave an illuminating lecture titled Making Reinforcement Learning Data-Efficient. We are most grateful to him for his excellent presentation.

The 57th Allerton Conference also featured two tutorial talks, delivered by Christoforos Hadjicostis of University of Cyprus titled Distributed Average Consensus in the Presence of Network Uncertainty and Adversarial Conditions and Angelia Nedich of Arizona State University titled Distributed Algorithms for Optimization in Networks. We are grateful to the presenters for their exciting presentations.

We thank Mr. Derek Peterson, Ms. Jordan Gifford and their staff at the Allerton Retreat Center for cheerfully accommodating our Conference and for their constant attention to our needs. It is also a great pleasure to thank all the staff members of the Coordinated Science Laboratory who so ably handled all the practical aspects of organizing the Conference. In particular, we wish to mention Ms. Jayne Cook and Ms. Laura Reardon who handled all the business affairs, Mr. Khlaf Alkhaldi who provided IT support, and Ms. Chris Holt and her students who helped in a variety of ways. Most of all, however, we would like to thank our Conference Secretaries, Ms. Angie Ellis, Ms. Stephanie McCullough, Ms. Brenda Roy, Ms. Linda Stimson and Ms. Peggy Wells, who worked year-round in handling announcements, calls for papers, program preparation, Allerton House arrangements, registration, and the final editing of these Proceedings. The lion's share of the credit for the success of the Conference belongs to these individuals and it gives us the greatest pleasure to acknowledge this here.

We close this foreword with the countdown for the reopening of the time capsule buried Tuesday, September 30, 1997, on the occasion of the Thirty-Fifth Annual Allerton Conference. This leaves 13 years remaining until its reopening. The capsule can be reached by taking 35 paces North from the Allerton House, along a line extending from the eastern face of the house. The GPS coordinates (WGS84) of the time capsule are 40 degrees 00 minutes 15.39750 seconds North latitude, and 88 degrees 38 minutes 41.74234 seconds West longitude.

Sincere thanks go to everybody who participated in, contributed to, and made the Conference a continued success.

Daniel Liberzon and Alejandro Dominguez-Garcia
October, 2018