Erik Thompson

Narrator

Paul Davies

Self - Physicist, Author, 'The Mind of God'

Robert R. Cargill

Self - University of Iowa

Alex Filippenko

Self - Univ. of California, Berkeley

Laura Danly

Self - Griffith Observatory

Clifford V. Johnson

Self - Univ. of Southern California

Robert Spitzer

Self - Magis Center of Reason and Faith

Leonard Mlodinow

Self - Co-Author, 'The Grand Design'