us on twitter, facebook, and instagram, tonight we are honored to welcome leonard mlodinow and rob polson. leonard received his phd in theoretical physics from the university of california berkeley, was in alexander fellow at the max planck institute. and was on the faculty of california institute of technology. his previous books include the bestsellers, the green divide and a briefer history of time both with stephen hawking and subliminal the winner of the science award and war of the worldviews. as well as elastic, siemens rainbow and the appraising thinkers. rob joins us as evening for conversation about his new book stephen hawking a member of friendship and physics, one of the most influential physics about time he touched the lives of millions. recalling his two decades as stephen hawking's collaborator and friend he brings the complex man into focus in a unique and deeply personal portrayal. he puts us in the room as hawking indulges his passion for white and curry ensures his feelings on one, death and disability in the philosophy and physics. it's deeply affecting account of fr