''. Hassler worked as a journalist at
The Leader-Observer in
Queens and then at American Baptist Publications in
Philadelphia. In 1942, Hassler was appointed editor of
Fellowship, a pacifist publication published by FOR USA. He was subsequently imprisoned for his stance as a
conscientious objector during
World War II. While in prison, he authored,
Diary of a Self-Made Convict. In 1957, he co-authored
Martin Luther King and the Montgomery Story, an advocacy
comic book published by FOR USA. The following year, in 1958, Hassler was appointed executive secretary of FOR USA. Hassler led FOR USA delegations to
Vietnam in 1965 and 1967 during the
Vietnam War, during which he began a collaboration and friendship with
Thích Nhất Hạnh. In 1969, Hassler founded the Dai Dong Project, which linked war, environmental issues, and poverty, and became the president of the
International Confederation for Disarmament and Peace. In 1970, he published
Saigon, U.S.A., Hassler supported the
Vietnamese Buddhists, arguing they could form a
nonviolent "third force" for peace independent of both the
South Vietnamese and
North Vietnamese governments. In 1974, Hassler retired from his position with FOR USA. With his wife Dorothy, he co-founded a retirement community in
Almeria, Spain. In the 1980s, he returned to New York City. ==Death==