 After World War II Michaelis worked for the British Intelligence Objectives Committee, which investigated enemy scientific developments, and in 1946 he married Ann Aikman, with whom he was to have three children.His distinguished career as a science journalist and editor spanned several activities including the “BIOS project”, technical writing at “CIBA” and “International Telecommunication Union” in Switzerland.Later he became a scientific film author in Australia, editor of the British magazine "Discovery", science correspondent for "The Daily Telegraph" where he wrote daily reports on science and technology from 1969 to 1973.