I received considerable help and inspiration from various people while writing this book.
First and foremost I would like to thank my student Haobin Ni with whom I've had numerous discussions about the initial design of Harmony. Haobin even contributed some code to the Harmony compiler. Many thanks are also due to William Ma who refactored the Harmony code to make it easier to maintain. He also wrote the first version of the behavior automaton generator and created the first graphs using the graphviz tool. I have had lots of discussions with him about a wide range of improvements to the Harmony language, many of which came to fruition. I also want to thank Ariel Kellison with whom I discussed approaches to formally specify the Harmony virtual machine in TLA+.
Kevin Sun and Anthony Yang built a beautiful VSCode extension for Harmony called HarmonyLang and proceeded to build an animator for Harmony executions and two cloud-based Harmony offerings, which you can learn about at http://harmony.cs.cornell.edu. They also developed much of that web site and made valuable suggestions for improvements to the Harmony language. Later they were joined by Shi Chong Zhao, who also made significant contributions. Kevin and Anthony continue to make great contributions to the Harmony distribution.
Most of what I know about concurrent programming I learned from my colleague Fred Schneider. He suggested I write this book after demonstrating Harmony to him. Being a foremost security expert, he also assisted significantly with the chapter on the Needham-Schroeder protocol.
Leslie Lamport introduced me to using model checking to test properties of a concurrent system. My experimentation with using TLC on Peterson's Algorithm became an aha moment for me. I have learned so much from his papers.
I first demonstrated Harmony to the students in my CS6480 class on systems and formal verification and received valuable feedback from them.
The following people contributed by making comments on or finding bugs in early drafts of the book: Alex Chang, Anneke van Renesse, Brendon Nguyen, Hartek Sabharwal, Heather Zheng, Jack Rehmann, Jacob Brugh, Liam Arzola, Lorenzo Alvisi, Maria Martucci, Nalu Concepcion, Phillip O'Reggio, Saleh Hassen, Sunwook Kim, Terryn Jung, Trishita Tiwari, Xiangyu Zhang, Yidan Wang, Zhuoyu Xu, and Zoltan Csaki.
Finally, I would like to thank my family who had to suffer as I obsessed over writing the code and the book, at home, during the turbulent months of May and June 2020.
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