Rooum has had a long relationship, with interruptions, with Peace News, his first work appearing for them in 1962.
Brock took on the role of assistant editor of Peace News in 1946 and became editor in 1955.
He left Peace News in 1964.
Between 1946 and 1952 Peace News published more than 160 articles dedicated to the discussion of Gandhi's relevance to the West.
During the 1960s, he lived in London, where he edited the newspaper Peace News.
Rety's partner and two children survived him: his daughter Emily is editor of Peace News.
From the 1940s on, Peace News began to take a strongly critical line towards British rule in Kenya.
Peace News suspended publication at the end of 1987, intending to relaunch after a period of rethinking and planning.
Peace News has been associated with initiating numerous campaigns, and a number of its staffmembers have been arrested for taking part in peace actions.
Between 1936, when Peace News was founded, and 1957, it had almost 350 articles on related topics.