#1 David K.(David Kellogg) Lewis 1941-2001 is the author of On the Plurality of Worlds. He is also David Lewis (4).
#2 David K. Lewis 1948- is the author of The Gospel According to Generation X: The Culture of Adolescent Belief. He is the director of the Center for Adolescent Studies, Abilene Christian University. He is also David Lewis (17)