Lowell Birge Harrison: A Pioneer of Atmospheric Tonalism Lowell Birge Harrison (1854 – 1929) stands as a significant figure in American landscape painting, particularly recognized for his contribution to the tonalist movement. Born in Philadelphia, Pennsylvania, he was the younger brother of celebrated artist Thomas Alexander Harrison, fostering an artistic lineage marked by dedication and exploration. His formative years were shaped by studying at the Pennsylvania Academy of Fine Arts, where John Singer Sargent’s influence instilled a profound appreciation for observation and expressive tec…