at a young age, and was expelled from the Agassiz primary school in San Francisco at age 7. Around age 10, he collided with a streetcar while riding his bicycle and remained unconscious for six days. After he awoke, Nelson's behavior became erratic, and he suffered from frequent headaches and memory loss. Described as a "psychotic prodigy," Nelson exhibited increasingly bizarre, manic behaviors in his childhood, such as talking to invisible people, compulsively quoting Biblical passages, and watching female family members undress. His grandmother noted occasions where Nelson would embark to school in freshly-cleaned clothes and return home in rags, as though he had exchanged clothes with a homeless person. Nelson's strong religious upbringing remained a pervasive influence in his life, and he obsessively read the Book of Revelation as a teenager. In his early teenage years, Nelson began frequenting brothels and bars in San Francisco's Barbary Coast red-light district, and contracted a venereal disease. As he progressed through puberty, Nelson grew into a stocky, physically fit young man. He would sometimes entertain his family with his physical talents, such as walking on his hands or lifting heavy objects with his teeth. Crimes Early offenses; institutionalization Nelson began his criminal career at a young age, and was sentenced to two years in San Quentin State Prison in 1915 after breaking into a cabin in rural Plumas County which he believed had been abandoned. He was paroled for this offense on September 6, 1916, but was arrested again in Stockton on March 9, 1917, for petty larceny. Nelson spent another six months incarcerated before being discharged, after which he was arrested in Los Angeles for burglary charges. After spending approximately five months in Los Angeles County Jail, Nelson escaped. Sometime in late-1917, Nelson enlisted in the U.S. military, but deserted after six weeks. He repeated this pattern on several occasions, enlisting in different military branches under different names before deserting. In 1918, Nelson was committed to the Napa State Mental Hospital after behaving oddly and erratically during one of his brief stints in the United States Navy. A Navy psychologist noted that Nelson was "living in a constitutional psychotic state." Upon his arrival at Napa State Mental Hospital, a psychologist who observed Nelson on May 21, 1918, noted that he did not appear "violent, homicidal, or destructive." William Pritchard, a psychiatrist who conducted a preliminary interview with him, noted that Nelson