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Via AdS/CFT duality, black holes in asymptotically anti de Sitter spaces are dual to thermal ensembles of well-defined quantum field theories, in principle amenable to detailed analysis. Yet many of the quantum gravitational questions they pose are still not resolved satisfactorily, owing to the impracticality of the necessary calculations in most known examples. In this talk I will give an overview of our recent work which exploits solvable models of chaotic many-body systems with holographic duals and which allow us to characterize black-hole micro states with great precision. I plan to discuss the thermal properties of pure states, as well as new results on ergodic and non-ergodic behavior of information scrambling.