The legacy of ADM
This tribute to the memory of my old friend and collaborator, Richard Arnowitt, focuses on the history, results and physical significance of the Arnowitt–Deser–Misner (ADM) formulation of general relativity, starting from its birth in 1958–9 through its completion, in a series of over a dozen papers, in 1962–3. A few of its later applications are also mentioned.