· PhD Student, ETH Zurich, Learning & Adaptive Systems Group2022–
· Professor, York University1968–1985
· Professor, University of Alberta1959–1968
· Chair of the Mathematics Department, Philander Smith College1955–1959
· Head of Mathematics, Fisk University1950–1955
· Assistant Professor, Pennsylvania State University1949–1950
· Instructor, City College of New York1946–1949
· Mathematically Related War Work, National Advisory Committee for Aeronautics1941–1943
· Ph.D. in Mathematics, University of Cincinnati1936–1941
· Master's Degree, University of Cincinnati1935–1936
· B.A. in Mathematics, Cornell University1932–1935