Mohammad Sadoghi is an Assistant Professor in the Computer Science Department at the University of California, Davis. Formerly, he was an Assistant Professor at Purdue University. Prior to joining academia, he was a Research Staff Member at IBM T.J. Watson Research Center for nearly four years. He received his Ph.D. from the Computer Science Department at the University of Toronto in 2013. At UC Davis, Prof. Sadoghi leads the ExpoLab research group with the aim to pioneer a new exploratory data platform (referred to as ExpoDB) a distributed ledger that unifies secure transactional and real-time analytical processing, all centered around a democratic and decentralized computational model.Spyros Blanas is an Assistant Professor in the Department of Computer Science and Engineering at The Ohio State University since 2014. He received his Ph.D. at the University of Wisconsin-Madison, where he was a member of the Database Systems group and the Microsoft Jim Gray Systems Lab. Part of his Ph.D. dissertation was commercialized in Microsoft SQL Server 2014 as the Hekaton in-memory transaction processing engine. His research interest is high-performance database systems and his current goal is to build a data management system for high-end computing facilities.

• Introduction.- Transaction Concepts.- Multi-Version Concurrency Revisited.- Coordination-Avoidance Concurrency.- Novel Transactional System Architectures.- Hardware-Assisted Transactional Utilities.- Transactions on Heterogeneous Hardware.- Outlook: The Era of Hardware Specialization and Beyond.- Bibliography.- Authors' Biographies.

Mohammad Sadoghi is an Assistant Professor in the Computer Science Department at the University of California, Davis. Formerly, he was an Assistant Professor at Purdue University. Prior to joining academia, he was a Research Staff Member at IBM T.J. Watson Research Center for nearly four years. He received his Ph.D. from the Computer Science Department at the University of Toronto in 2013. At UC Davis, Prof. Sadoghi leads the ExpoLab research group with the aim to pioneer a new exploratory data platform (referred to as ExpoDB) a distributed ledger that unifies secure transactional and real-time analytical processing, all centered around a democratic and decentralized computational model.Spyros Blanas is an Assistant Professor in the Department of Computer Science and Engineering at The Ohio State University since 2014. He received his Ph.D. at the University of Wisconsin-Madison, where he was a member of the Database Systems group and the Microsoft Jim Gray Systems Lab. Part of his Ph.D. dissertation was commercialized in Microsoft SQL Server 2014 as the Hekaton in-memory transaction processing engine. His research interest is high-performance database systems and his current goal is to build a data management system for high-end computing facilities.

• Introduction.- Transaction Concepts.- Multi-Version Concurrency Revisited.- Coordination-Avoidance Concurrency.- Novel Transactional System Architectures.- Hardware-Assisted Transactional Utilities.- Transactions on Heterogeneous Hardware.- Outlook: The Era of Hardware Specialization and Beyond.- Bibliography.- Authors' Biographies.

Mohammad Sadoghi is an Assistant Professor in the Computer Science Department at the University of California, Davis. Formerly, he was an Assistant Professor at Purdue University. Prior to joining academia, he was a Research Staff Member at IBM T.J. Watson Research Center for nearly four years. He received his Ph.D. from the Computer Science Department at the University of Toronto in 2013. At UC Davis, Prof. Sadoghi leads the ExpoLab research group with the aim to pioneer a new exploratory data platform (referred to as ExpoDB) a distributed ledger that unifies secure transactional and real-time analytical processing, all centered around a democratic and decentralized computational model.Spyros Blanas is an Assistant Professor in the Department of Computer Science and Engineering at The Ohio State University since 2014. He received his Ph.D. at the University of Wisconsin-Madison, where he was a member of the Database Systems group and the Microsoft Jim Gray Systems Lab. Part of his Ph.D. dissertation was commercialized in Microsoft SQL Server 2014 as the Hekaton in-memory transaction processing engine. His research interest is high-performance database systems and his current goal is to build a data management system for high-end computing facilities.

• Introduction.- Transaction Concepts.- Multi-Version Concurrency Revisited.- Coordination-Avoidance Concurrency.- Novel Transactional System Architectures.- Hardware-Assisted Transactional Utilities.- Transactions on Heterogeneous Hardware.- Outlook: The Era of Hardware Specialization and Beyond.- Bibliography.- Authors' Biographies.