| Sumario: | Welcome to the International Symposium on High-Performance Parallel and Distributed Computing (ACM HPDC 2019)!, the premier conference at the intersection of high performance and distributed computing, now in our 27th year. HPDC is fortunate to be co-located and sponsorsed by ACM FCRC this year which is providing exceptional keynotes, the Turing Award Lecture, and a chance to mingle with our colleagues in other disciplines of Computer Science. ACM HPDC has a focus on high-performance parallel and distributed computing topics over the years including platforms spanning clouds, clusters, grids, big data, massively multicore, and extreme-scale computing systems. One of the unique features of HPDC is that it welcomes a blend of ideas ranging from applied research in the form of experience papers on operational deployments and applications, and more fundamental research in parallel and distributed techniques and systems. The conference has always appreciated the heroic work taken to deploy real systems and applications and the insights gained by live measurement and experimentation. The HPDC 2019 program is no exception with topics ranging from hybrid systems, scalable graph processing, GPU applications, and cloud systems, to name a few. In addition to a strong technical program, the HPDC 2019 achievement award was given to Professor Geoffrey Fox, Indiana University for his foundational contributions to parallel computing, high-performance software, the interface between applications and systems, contributions to education, and outreach to underrepresented communities. This year the conference will include five exciting workshops on cutting edge topics including perenial favorites ScienceCloud and ROSS. The program will also include a PhD Forum event for our future budding stars in topics relating to HPDC. Conferences like HPDC require a large commitment by the community. First, I would like to acknowledge and thank our sponsors ACM SIGARCH and the University of Arizona, and supporters, IBM, DOE, and the NSF. Next, I would like to thank the various organizing committees that ensure that HPDC remains a top-tier conference at the intersection of high performance and distributed computing. My deepest thanks go to Evgenia Smirni and Ali Butt for their leadership as co-chairs of the Program Committee helping to bring a strong and exciting technical program which is a cornerstone of HPDC. I would also like to acknowledge the HPDC Awards Committee led by Douglas Thain in their selection of Geoffrey Fox for the 2019 HPDC Achievement Award. Additional thanks go to Alex Iosup for chairing the Workshop committee which has had a long tradition at HPDC bringing cutting-edge topics that complement the main program. Thanks also to Jay F Lofstead II for leading the effort as Poster Chair and the mentoring session as part of the Ph.D. Forum. I would also like to acknowledge Antonino Tumeo for his work as our Publications Chair, an often thankless job. Conferences cannot succeed without the tireless work of publicity and I would like to thank Ioan Raicu, Torsten Hoefler, Shuaiwen Leon Song, Kenjiro Taura, for spreading the word. Lastly, I express gratitude to Zachary Leidall, our Web chair, for keeping the HPDC 2019 Web site informative and up to date. Finally, let me thank the entire HPDC community including the steering committee, organizing committee participants, volunteers, session chairs, attendees, and co-authors, for making HPDC 2019 a great success.
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