Jean Lasserre, who lectured with Bonhoeffer on peace in Mexico in 1931; Lawrence Whitburn, one of his parishioners in London, 1933–1935; Theodore Heckel, a German church authority who heard Bonhoeffer speak on a number of occasions and interacted with him personally during much of the 1930s; Joachim Kanitz and Wolf-Dieter Zimmermann, both students of Bonhoeffer in Berlin and at Finkenwalde; Herbert Jehle, who was converted to pacifism through Bonhoeffer; Paul Lehmann in the summer of 1939; and Karl Barth, who met with Bonhoeffer at least six times between 1940 and 1942—all claim that
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