Eric R Johnston is a code optimization specialist with experience in real-time systems and experimental hardware. He has a B.S. in Electrical Engineering and Computer Science from U.C. Berkeley, which he paid for by writing computer games for Lucasfilm. In addition to 20 years at LucasArts and ILM, he has worked at NASA Ames Research Center, and performed code optimization for Autodesk, Dell and Google. He started writing his own quantum computation simulator in 1998, and in 2015 became a Postdoc Researcher in Quantum Engineering at University of Bristol Centre for Quantum Photonics, during which he also worked as a flying trapeze instructor. EJ is co-author of Programming Quantum Computers: Essential Algorithms and Code Samples (PQC/EACS) along with Nic Harrigan and Mercedes Gimeno-Segovia, seen here with James Weaver at Q2B 2019. EJ is currently Senior Quantum Engineer at PsiQuantum (where he is "building something unexpected"). He describes himself as "a software engineer with extensive experience leading small teams in the development of groundbreaking technology on new and experimental hardware and with a focus on machine-level optimization and rapid invention in technological disciplines not yet crowded by experts." He is also an aerial and acrobatic stunt and mocap performer, trained in tumbling, trampoline, flying trapeze, and crashing into hard surfaces with minimal injury. Here's an announcement and a description of the PQC/EACS book on the blog Quanta for Breakfast (includes a link to EJ's Twitter feed). An older video presentation is available here.