Dr. Stephenson focuses on the synthesis of sensors based on supermolecular interactions, utilizing synthetic organic chemistry to form useful new materials; in other words, his main interest is in studying the interaction of molecules in order to make biocompatible sensing materials. Specifically, Dr. Stephenson's projects work to synthesize and study new sensors based on xanthene dyes such as rhodamine B.  The sensors are formed by modifying existing dyes to have specific functions.