Exhibition locales included New York City, Fort Worth, Los Angeles, San Antonio, London (Beaux Arts Gallery) and the Crawford in Cork (1940).
He was listed as a member of the advisory board of editors of a later version of The Irish Review published in 1934, which included George Lennon (1900-1991) of Dungarvan, former commanding officer of the West Waterford IRA Flying Column (1919-1921) as business manager.
At this time, either in Taos, New Mexico or New York City, he most likely met republican guerrilla leader and author (On Another Man's Wound, The Singing Flame) Ernie O'Malley.
A 2010 exhibit at St John Fisher College, Rochester, New York included Power O'Malley paintings from the collections of granddaughter Marietta Whittlesey and Ivan Lennon.
In 2015 the Irish American Heritage Museum of Albany, NY presented the exhibition Visions of Ireland: The Artwork of Michael Augustine Power O'Malley.