He did much reporting on anti-Semitism in Germany after the war. After immigrating to Canada with his wife Nina in 1954, Donaldson took up a job at the newspaper Toronto Telegram, and indeed one of his obituaries recalls him as having worked for the paper "during the wild circulation wars with the Toronto Star in the 1950s and 1960s." As part of that competition between the papers, in 1955, under the auspices of the Toronto Telegram Donaldson built the first fallout shelter in Canada and lived in it for two days while the Telegram published articles about it.
He was known for his reporting on anti-Semitism after World War II, and he worked at the Toronto Telegram newspaper during a period of intense competition with the Toronto Star. He also built the first fallout shelter in Canada to promote the Toronto Telegram.