Greyserman is a data guy, a quant who made a fortune on Wall Street, trained to seek patterns in markets and to trust what numbers tell him. He has no particular fondness for hockey. It interests him mainly as a vehicle for explaining his real passion, which is how decision-making gets distorted by biases, glitches, gut instincts and, yes, optics. These hockey coaches, when they wait too long to pull the goalie and lose the game, they are choosing to be wrong rather than look wrong.