Louis Anthony DeMayo was born in Philadelphia, Pa. in 1926, a first generation Italian-American.  After serving in the Marines for three years during World War II, DeMayo attended the Pennsylvania Academy of Fine Arts and the Hussian School of Art.  He had his first exhibition in 1952.

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DeMayo's early works have been exhibited at the Philadelphia Museum of Art, Temple University, Detroit Institute of Art, Moore College, and the Philadelphia Civic Center as well as being displayed in some of New Yorks's finer galleries.

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DeMayo moved to Phoenix, Arizona in 1971 to take the post of Art Director for Arizona Highways Magazine.  he very quickly discovered a fascination and ardent appeal for Arizona's Native American tribes and left Arizona Highways to concentrate on his career as an artist.

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Over time DeMayo's  work evolved, and soon he became recognized for his style of contemporary southwest art.  During his long and lauded career DeMayo has painted hundreds of Native American images, and his work has been acquired by a breadth of art lovers and private collectors across Arizona, the United States, and as far reaching as China and Germany. DeMayo made a segue to abstract art around 2002 and in 2011, DeMayo was awarded the prestigious Pollack-Krasner Foundation Grant.  He continued painting into his 90th year.

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His works have appeared in such varied publications as Time magazine, Advertising Age, Today magazine, Fortune magazine, and Arizona Highways.

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Louis DeMayo has been considered a trailblazer in the area of contemporary southwestern art.