Dr. Kotsubo was born and raised in San Jose, CA. He did his undergraduate studies at San Jose State University and the University of California, Los Angeles. He then went to the University of California, San Francisco where he received his doctorate. After graduating from UCSF he practiced as a general dentist for two years before going back to school in New York City at Columbia University for his endodontic specialty certificate. He has been in practice since 1990.
Dr. Kotsubo is an active member of the American Dental Association, California Dental Association, Western Los Angeles Dental Society, American Association of Endodontists, and the American Society of Forensic Odontology.
In his spare time he enjoys golf, and entertaining friends with his passion for cooking and bringing people together. He also enjoys wine collecting and working out at the gym.