Jaime Lester is a hedge fund industry veteran who has worked at firms such as Steinhardt Partners and David Einhorn’s Greenlight Capital. He is also an adjunct professor at Columbia Business School and has managed his own investment fund for nine years. We discuss his book “Pause to Think,” which is a compilation of thirty-two mental models. Jaime also applies these models to various frameworks, such as how to make better decisions and how to become happier.