Abstract: As intelligent agents assume larger role in our daily lives, reasoning by humans about liability of such agents as well as reasoning by the intelligent agents themselves about liability becomes more important. The existing laws, written with humans in mind, will eventually need to be re-interpreted in terms of their applicability in a hybrid environment that consists of humans and intelligent agents. In some cases, new laws will need to be written to redefine liability in the context involving intelligent agents. As a first step in this direction, we need to have a formal definition of liability that can be applied to intelligent agents and logical rules that the machines can use to reason about their own and human liability. In this talk I will discuss several of my recent works on formal logical systems for reasoning about liability.