The APS and the computing divisions in CELS are planning to hold a series of Town Hall meetings. The goal of these Town Hall meetings is to develop a common vision of the big challenges and opportunities associated with computing in the APS-U era, the capabilities needed to address those challenges and opportunities, and how the APS and CELS can work together to provide those capabilities. As a group across the APS, CELS, the APS Collaborative Access Teams (CATs), and the larger interested Argonne community, we will discuss how we can work together on transformational capabilities that will accelerate science, and explore how advanced computing and APS-U can together create the leading synchrotron light source instrument worldwide and enable discoveries that would otherwise not be possible. Breakout groups will focus on main topical areas: 1. New algorithms, math, and AI/ML 2. Scalable software tools 3. Workflow and orchestration 4. The APS-CELS computing architecture 5. Sustainable and discoverable data repositories 6. Networking The primary outcome of the APS / CELS Town Hall is a vision and roadmap detailing work that must be undertaken over the next decade as well as near-term steps required to get started. A written report will be generated by mid-February 2021. APS / CELS Town Hall meetings will be held December 7 - 15, 2020. Please view the schedule and register at the event's website at: https://events.cels.anl.gov/event/36. We look forward to working with you as we shape these exciting opportunities together. Best Regards, Nicholas Schwarz, Ian Foster, Michael Papka, Salman Habib, and Valerie Taylor -- Computing mailing list [email protected] https://lists.cels.anl.gov/mailman/listinfo/computing