Dr. Loretta Breuning is founder of the Inner Mammal Institute and author of "Habits of a Happy Brain: Retrain your brain to boost your serotonin, dopamine, oxytocin and endorphin." As professor of management at Cal. State East Bay, and as a mom, Loretta was not convinced by prevailing theories of human motivation. Then she studied the brain chemistry we share with earlier mammals, and everything made sense.