[3] During World War II, following the signing of Executive Order 9066, his family was interned at Pinedale, California, and then at Tule Lake.

After the war, the family moved to Seattle's Japantown where Moriguchi's father re-established Uwajimaya on South Main Street.

[7] Moriguchi, along with Kristi Yamaguchi, was honored by the JACL as a "Japanese American of the Biennium" in 1992.

On June 18, 2015, he visited Ehime University to discuss internship programs for students in the United States.

[15] Although he did not own Nagomi Tea House, Moriguchi founded it on Uwajimaya's former business site.