Jim Abrahams
Self - Father / Founder, Charlie Foundation / Filmmaker
Vinnie Tortorich
Self - Narrator / Producer / Trainer / Author
Bret Scher
Self - Cardiologist
Gary Taubes
Self - Journalist / Author
Dave Feldman
Self - Software Engineer
Eric Westman
Self - Internal Medicine Doctor
Andreas Eenfeldt
Self - Physician
Drew Pinsky
Self - Physician
Georgia Ede
Self - Psychiatrist
Nina Teicholz
Self - Journalist
Vilhjalmur Stefansson
Self - Explorer (archive footage)
Ivor Cummins
Self - Biochemical Engineer
Ancel Keys
Self (archive footage)
Jeffry Gerber
Self - Physician
George McGovern
Self - Politician (archive footage)
Gary Fetke
Self - Orthopaedic Surgeon
