Andrew Stewart's research supports the development of next-generation ocean science technology and the creation of new tools to improve robotic exploration of marine environments. Stewart's interests include dynamics and automated control of mechanical systems, decision-making dynamics in mixed teams of humans and robots, and development of deployable hardware for exploration of remote environments. Stewart contributes to all phases of development from conceptual design to prototype fabrication and testing. He has worked to develop a number of mobile sensor platforms, including unmanned air vehicles and autonomous underwater vehicles. Through employing control theoretic tools and design methodologies rooted in fundamental principles, Stewart aims to extend the limits of human presence in the ocean.