John Zeisel is president of Hearthstone Alzheimer Care and founder of the Heartstone Way, an innovative and practical approach to the care ofAlzheimer's sufferers. He developed the Artists for Alzheimer's program (ARTZ), which develops cultural experiences for Alzheimer's sufferers. He has a PhD in sociology from Columbia and has taught at Yale, Harvard and McGill.Sonja Lyubomirsky is Professor of Psychology at the University of California - one of the youngest people to attain the rank of full Professor in the University's history. She lives in Santa Monica with her family.