Josh R. de Leeuw

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About

Josh R. de Leeuw is a cognitive scientist and software engineer best known for creating **jsPsych**, a widely adopted JavaScript library for running behavioral experiments online. His primary research areas span **computational cognitive science**, **human decision-making**, and **open-source tools for experimental psychology**. de Leeuw’s major contribution lies in democratizing web-based behavioral research: jsPsych simplifies the design, execution, and sharing of reaction-time and survey experiments, enabling thousands of researchers to collect high-quality data remotely. The library has accumulated **over 2,000 citations** and is used in labs worldwide, fundamentally shifting how cognitive and psychological studies are conducted. Beyond jsPsych, his work includes early explorations in **autonomous prediction systems** for robotics, though his lasting impact stems from bridging programming and experimental rigor. de Leeuw’s commitment to reproducibility and accessibility has made him a pivotal figure in modern behavioral science, empowering students and seasoned researchers alike to conduct robust, browser-based experiments without extensive coding expertise.