Miller became a committed conservative after reading Guns, Crime, and Freedom, a book against gun control by National Rifle Association Chief Executive Officer Wayne LaPierre.[20][21] While attending Santa Monica High School, Miller began appearing on conservative talk radio.[20][18] In 2002, at the age of 16, Miller wrote a letter to the editor of the Santa Monica Outlook, criticizing his school's response to 9/11 in which he stated that "Osama Bin Laden would feel very welcome at Santa Monica High School."[20][22] Miller invited conservative activist David Horowitz to speak, first at the high school and later at Duke University, and afterwards denounced the fact that neither of the centers would authorize the event.[20] Miller was in the habit of "riling up his fellow [high school] classmates with controversial statements"[23] and telling Latino students to speak only English.[21][23][24][25]