Our Providers

Dr. Masayasu Kihira

Board-Certified Family Physician
Clinic Director

Dr. Kihira was born and raised in Nagoya, Japan. After graduating from Nagoya University School of Medicine, he completed his residency in orthopedic surgery at Nagoya University related hospitals and passed the Orthopedic Board Exam. While having residency training in Japan for 7 years, he obtained his Ph.D.
He came to the United States for a couple of years initially for research, but he made a life changing decision to practice in U.S in 1992. He passed medical boards and completed residency in family medicine at Wake Forest University in North Carolina and became board certified in Family Medicine in 1995.
After practicing as a family doctor in Florida for 3 years, he became the clinic director of Nihon Clinic Atlanta in 1998.
Dr. Kihira moved to California in 2004 and opened Nihon Bay Clinic as the clinic director. As a family doctor and a former orthopedist, his knowledge ranges over internal medicine, pediatrics, surgery, orthopedics, obstetrics and gynecology, dermatology, ear nose and throat, ophthalmology, urology, psychiatry, and complete physical exams (Ningen Dock) as well as physical therapy.

Dr. Ayako Yano

Board-Certified Pediatrician

Dr. Yano was born and raised in Tochigi, Japan. She graduated from Toho University School of Medicine. She completed pediatrics residency program at Toho University Ohashi Medical Center and later worked at the National Center of Neurology and Psychiatry of Japan. She practiced in Japan for 5 years.
Dr. Yano came to New York for research at Columbia University in 1992. She made the decision to stay and practice in the States after getting married. After passing her medical boards, she completed her pediatrics residency program at Elmhurst Hospital Center with the Mount Sinai Health System in New York. She is board certified in Pediatrics.
She moved to the Bay Area in 2003 and started working at Nihon Bay Clinic. She is married to a surgeon and has two boys.

Dr. Yukiko Kashiwa Poon

Board-Certified Pediatrician

Dr. Poon was born in Hokkaido and raised in Ibaraki, Japan. She came to the States to study medicine. She graduated from Loma Linda School of Medicine in 2007 and completed pediatric residency at Loma Linda Children’s Hospital and is board certified in Pediatrics.
She practiced as a hospitalist for several years at Miller Children’s Hospital at Long Beach, CA and Sutter Memorial Hospital in Sacramento, CA.
Dr. Poon moved to the Bay Area and started working at Nihon Bay Clinic in 2015. She enjoys hiking, playing piano & clarinet, and spending time with her husband and son.

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