Monsignor Wallesa was Vicar Apostolic of the Mariana and Caroline Islands from 1912 to 1922.

An account of the Mariana Islands and Caroline Islands, divided into seven chapters: Natural Conditions, Social Conditions of the Islanders, Stages of Life of the Islanders; Religion and Morality; the Situation of the Islanders with Respect to Christianity and the Roman Catholic Mission; and the Catholic Mission under Japanese Rule. The Caroline Islands are today are divided between the Federated States of Micronesia and Palau. For a summary of the contents and a note on the background and authorship of the memorandum, see the Bureau's newsletter Pambu, Feb. 1969:7, pp.1-6 and June 1969:11, pp.8-9.