John McCall is a programming language designer and compiler engineer at Apple, where he has worked since 2008 on Swift, Clang/LLVM, Objective-C, and C++. He currently chairs Swift’s Language Steering Group and is a core contributor to major parts of the Swift compiler, including SIL, LLVM IR generation, the language ABI, and the runtime. Before joining Apple, he received an M.S. in computer science from Portland State University and earned a B.S. in mathematics from Carnegie Mellon University.