Dr. Dizon has been at the Columbia University Medical Center since 1991, where he did his cardiology and electrophysiology training. He has remained on full-time staff and maintains a busy clinical practice, with offices in White Plains and in the medical center in upper Manhattan.

Dr. Dizon's area of clinical expertise include cardiac arrhythmia management, including ablation of arrhythmias and device therapy. He has an active teaching interest, having mentored many students and fellows. He has participated in numerous multicenter and investigator initiated studies, and has authored or co-authored over 100 peer reviewed articles and abstracts.