A favorite of John Y. Gerow as a young man, he spent much time visiting and working on the Gerow family dairy farm in Washingtonville, NY. He married Anna Georgena Gerow on October 13, 1909 after a 7 year courtship. She was the oldest daughter of John Young Gerow, a prominent dairy industry and banking businessman, and and his wife Sarah Amelia Hudson.

During World War I, he served as gunnery officer of the USS Ohio, and was gunnery officer of the USS George Washington. During this time the USS George Washington was afforded special honors after hostilities in Europe ceased. President Woodrow Wilson rode aboard the ship twice on his way to France for the Paris Peace Conference in 1919. The Treaty of Versailles that resulted established the League of Nations, imposed heavy reparations on Germany, and redrew the political boundaries of many nations. Mallon served as Captain of the USS Illinois in 1922 and retired from naval service in 1924.

He was President of the National Automobile Dealers Association in 1945 and 1946. In 1946 he successfully led the automobile dealers' campaign in Congress to preserve the historic dealers' discount. He owned the Mallon of Irvington Automobile Agency at 1128 Springfield Avenue in Irvington NJ.

He lived at the Military Park Hotel in Newark NJ and, after the death of John Y. Gerow, also managed the Gerow family dairy farm in Washingtonville, NY that was then owned by his wife Anna and her sister Susan Wright Gerow.

He died of a heart ailment at St. Michael's Hospital in Newark, NJ

A favorite of John Y. Gerow as a young man, he spent much time visiting and working on the Gerow family dairy farm in Washingtonville, NY. He married Anna Georgena Gerow on October 13, 1909 after a 7 year courtship. She was the oldest daughter of John Young Gerow, a prominent dairy industry and banking businessman, and and his wife Sarah Amelia Hudson.

During World War I, he served as gunnery officer of the USS Ohio, and was gunnery officer of the USS George Washington. During this time the USS George Washington was afforded special honors after hostilities in Europe ceased. President Woodrow Wilson rode aboard the ship twice on his way to France for the Paris Peace Conference in 1919. The Treaty of Versailles that resulted established the League of Nations, imposed heavy reparations on Germany, and redrew the political boundaries of many nations. Mallon served as Captain of the USS Illinois in 1922 and retired from naval service in 1924.

He was President of the National Automobile Dealers Association in 1945 and 1946. In 1946 he successfully led the automobile dealers' campaign in Congress to preserve the historic dealers' discount. He owned the Mallon of Irvington Automobile Agency at 1128 Springfield Avenue in Irvington NJ.

He lived at the Military Park Hotel in Newark NJ and, after the death of John Y. Gerow, also managed the Gerow family dairy farm in Washingtonville, NY that was then owned by his wife Anna and her sister Susan Wright Gerow.

He died of a heart ailment at St. Michael's Hospital in Newark, NJ