Dr. Feyissa is a neurologist who has specialized in epilepsy and clinical neurophysiology. His clinical focus includes brain tumor-related epilepsy, autoimmune-associated epilepsy, women with epilepsy, neuromodulation for epilepsy, and EEG. 

In addition to his clinical activities, Dr. Feyissa is active in research and is a recipient of intramural and extramural grant support. He authors expert content and publishes in high-impact scientific journals. He is also actively engaged in teaching and mentoring trainees across multiple levels.