N.L. Bowen, or Norman L. Bowen, was a prominent Canadian geologist known for his significant contributions to the field of petrology, particularly in understanding igneous rocks. He is best known for developing the Bowen's Reaction Series, which illustrates the sequence of mineral crystallization from magma as it cools. This work has been fundamental in the study of geological processes and rock formation. Bowen's research laid the groundwork for modern geology and has influenced various scientific disciplines. He served as a professor at the University of Chicago and was involved in numerous geological surveys. His legacy continues to impact the study of earth sciences today.