For our 200th episode, I’m delighted to welcome back Peter Singer, often called the world’s most influential living philosopher.

Peter Singer is an author and ethicist, and has been routinely called the most influential philosopher alive. He’s widely credited with kickstarting the modern animal protection movement with his 1975 mega-bestseller Animal Liberation, and with popularizing what’s now called the effective altruism movement through his early writings on poverty and more recently with his 2009 book The Life You Can Save.