He suffered severe head injuries, skull fractures, multiple tears in his scalp, a shattered ankle, damaged organs, extensive lacerations, and became comatose.

[7] Yamashiro had "a lonely childhood" as the youngest of four children in Moanalua, a residential area nestled between Fort Shafter and Tripler Army Medical Center.

[8] An American of Hawaiian, Okinawan, and Chinese ancestry,[9] he is the great-grandson of Honolulu detective Chang Apana, inspiration of the Hollywood character Charlie Chan by Earl Derr Biggers.

[15] He attended the University of Oxford Theology Summer School at Christ Church, Oxford, England (2018, 2019), conducted research at ten presidential library archives (NARA),[3] and earned his Doctor of Philosophy from Trinity Evangelical Divinity School of Trinity International University in Deerfield, Illinois (2020) under the guidance of Donald C. Guthrie.

His dissertation is titled, American Presidents and Childhood Trauma: Intersecting Religious Education from Franklin Roosevelt to Donald Trump.

Yamashiro's earlier research in religious influences on presidential decision-making was built on the work of Herbert A. Simon, Albert Bandura, and Nathan Leites.

[13] In 2022, Yamashiro began hosting the talk show The Good Life with Dr. Danny weekdays on WEZE and WROL, two Christian stations in Boston that are owned by Salem Communications reaching New England.

Yamashiro was selected for the Pacific Century Fellows and offered a prayer at a celebratory dinner hosted by the Governor of Hawaii, Benjamin Cayetano at the historic "Washington Place" (1999).