Dr. Beyenal is widely known for his biofilm engineering expertise in the area of microscale biofilm characterization and electron transfer processes in biofilms. The research in his laboratories has focused on the fundamental understanding of biofilm processes, their characterization, and applications of biofilm processes. He has developed many research tools for understanding biofilm processes at the microscale, including microelectrodes for monitoring local chemistry and electron transfer mechanism inside biofilms. He has developed mathematical models for predicting biofilm activity, electron transfer rates, and biofilm structure. He pioneered the studies of electron transfer processes in biofilms using microelectrodes and powering electronic devices using microbial fuel cells.