. "Ralph H. Johnson is an American philosopher, born in Detroit, Michigan. Johnson has been credited as one of the founding members of the informal logic movement in North America, along with J. Anthony Blair who co-published one of the movement's most influential texts, \u201CLogical Self-Defense,\u201D with Johnson."@en . . . "Ralph H. Johnson"@en . "Johnson,Ralph"@en . "American logician" .