Howard Hawks Mitchell
In 1910 he received a PhD from Princeton University as Oswald Veblen's first doctoral student. During the academic year 1910/1911 Mitchell was an instructor at Yale University. At the University of Pennsylvania he was an instructor from 1911 to 1914 and then a professor until his death in 1943 at age 58 from coronary thrombosis.
- "Determination of the finite quaternary linear groups". Trans. Amer. Math. Soc. 14 (1): 123–142. 1913.
- "On some systems of collineation groups". Bull. Amer. Math. Soc. 20 (3): 134–138. 1913.