 From 1945–1956, he was Chairman of the education working group of the Estonian Committee, 1954–1975 Director of the Bureau and assistant Chairman of the Estonian Committee, 1975–1982 Chairman of the Estonian Committee, and from 1982 onward served as Honorary Chairman of the Estonian Committee.From 1951–1979 he was also Secretary-General of the Estonian National Council.In 1998, Mark was awarded the honorary Doctor of Law degree by Tartu University.