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Spencer is a mathematician and entrepreneur. He founded Spark Wave, a startup foundry which creates novel software products designed to solve problems in the world (e.g. scalable care for depression, and technology for improving social science). He also founded, which offers free tools and training programs that have been used by over 150,000 people, designed to help improve decision-making and reduce thinking biases. Spencer has a PhD in applied math from NYU, with a speciality in machine learning. Previously, he co-founded a quantitative investment firm, where he designed algorithms to make daily predictions about thousands of stocks. Spencer's work has been featured by major media outlets such as the Wall Street Journal, the Independent, Lifehacker, Gizmodo, Fast Company, and the Financial Times.