Yuval Noah Harari is an Israeli medievalist, military historian, public intellectual, and popular science writer.

Marcus Aurelius (April 26, 121 CE – March 17, 180 CE) was a Roman Emperor (161–180 CE) born into a wealthy patrician family in Rome. Raised by his mother and paternal grandfather after his father's death, he is best known for his *Meditations*, a series of private writings on Stoic philosophy that remain a key source for understanding ancient Stoicism.

The School of Life is a British multinational publishing and education company founded in 2008 by British author and public speaker Alain de Botton.

Adam Smith was a Scottish economist and philosopher who was a pioneer in the field of political economy and key figure during the Scottish Enlightenment.

Jonathan David Haidt is an American social psychologist and author.