Chairman i World Health Organizations Subcommittee on Cancer Registration etc. 1950-57; Member WHO Expert Panel: Health Statistics 1951-63, Cancer: 1963-82; medlem af Executive Council of the International Cancer Union 1954-62; Secretary of Committee on the Geographical Pathology of Cancer 1951-62; Visiting Professor, University of Louisville, Kentucky 1963; Chairman Europ. Hum. Tumor Group 1973-75; President Intern. Ass. compar. Leukemia Research 1975-77; EF: medlem af Special Work Group Epidemiology 1974-80; Asbestos Panel 1975-82; Wissenschaftlicher Beirat Deutsches Krebsforschungs-Zentrum 1977-82; Internat. Comms. for Protection against Environmental Mutagens and Carcinogens 1978-84; formand for Den Danske Forening 1987-88, æresmedlem 1998.
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