Ryan Holiday is an American marketer and bestselling author, born June 16, 1987. He is known for his books on marketing, culture, Stoicism, and the human condition, which have been translated into thirty languages. Holiday has gained recognition for popularizing Stoicism, specifically the philosophy of Roman emperor Marcus Aurelius. His published works include "Trust Me, I'm Lying" (2012), "The Obstacle Is the Way" (2014), "Ego Is the Enemy" (2016), and "Discipline is Destiny.