BIOGRAPHIES 643 published his most important work, Medizin und Recht. 1932-1947, worked with the Committee of the International Red Cross to fight hunger and epi- demics. Einstein later praised his psychological sensitivity and judgement, called his influence on him paternal, and referred to him "as one of the most interesting individuals whom I have ever encountered." Sources: His notes, Estate of Heinrich Zangger, Zurich Erinnerungen Zangger 1967 Einstein to Carl Seelig, 20 August 1952, SzZE Bibliothek.