I create new software solutions that unleash people’s productivity and creativity with computers. For example, Java and JavaScript systems run efficiently by relying on my ideas, such as adaptive optimization and deoptimization, and generational garbage collection. Some of the most notable of these were originally built by my team, or my proteges.The design of the JavaScript language was partially inspired by the Self language that I designed with Randall Smith.I pioneered the application of cartoon animation techniques to graphical user interfaces. As a result, four of my papers have been honored by the Association for Computing Machinery for lasting impact over ten to twenty-four years. In addition, I received the 2009 Dahl-Nygaard award for outstanding career contributions in the field of object-orientation, and in 2010 was elected to ACM Fellow. My inventions and those I have taught have contributed materially to the field of object-oriented languages, virtual machines, programming environments, and user interfaces. I love to break new ground, and to solve hard problems, including finding and fixing difficult bugs.I have written a book on server-side Swift, investigated dynamic optimization for Swift storage management, built prototype apps for iOS, developed a context-sensitive programming paradigm, and investigated massive concurrency. For the past year at Apple, I have been enjoying the opportunity to improve the Swift development experience.I blog at http://blog.davidungar.net and tweet at http://twitter.com/senderPath. For a complete publication list see http://dblp2.uni-trier.de/pers/hd/u/Ungar:David. Below is only a partial listing of publications and my patents.Specialties: Swift language and implementation, object-oriented programming languages, virtual machines, programming environments, reflection architectures, animation in user interfaces.