After receiving his M.S. in 1951, from the University of Michigan, Stubblefield became
the Professor and Head of the Department of Mathematics at the University of Liberia at
Monrovia from 1952-1956. From 1957-1959, he was a Research Mathematician at
Detroit Arsenal. Upon receiving his Ph.D. in 1959, from the University of Michigan, he
served the as Lecturer and National Science foundation Post-Doctoral Fellow at the
University of Michigan in Ann Arbor until 1960. Stubblefield served as assistant Professor
of Mathematics at Stevens Institute of Technology in Hoboken, New Jersey form
1960-1961. He was an associate Professor of Mathematics at Oakland University, in
Michigan from 1961-1967. From 1967-1970, he was on leave. When he returned, he
was a Senior National Teaching Fellow at Prairie View, Texas until 1968. For the next
year, he would be a Visiting Professor and Visiting Scholar and Texas Southern University.
From 1969-1971, he was the Director of Mathematics in the Thirteen College Curriculum
Program. Then in 1971, he served as a Professor of Mathematics at Appalachian State
University in Boone, North Carolina until 1976. At the U.S. Department of Commerce in
Boulder, Colorado, he served as Mathematician/EEO Manager from 1976-1981. In 1992,
Stubblefield retired from the U.S. Department of Commerce with GERL/ERL/NOAA.
Stubblefield, along with others, helped to establish NAM as an international organization.
He was the person who, in 1978, approved NAM's first major grant. In 1994, he received
NAM's Distinguished Service Award, and in 2000, Stubblefield became the eight recipient
of NAM's highest award, the Lifetime Achievement Award (mad).
Through his many years of research,
Stubblefield had several publications on the subjects of
geometry, trigonometry, and computer programming. His publications that he used for
teaching were Informal Geometry, An Intuitive Approach to Elementary Geometry, and
Structures of Number Systems. In 1962, he published his paper entitled Some imbedding
and non-imbedding theorems for N-manifolds. Several years later in 1973, The number of
topologies on a set of eight elements, was published. Finally in 1980, he published the paper
Lower bounds for oddperfect numbers (beyond the googol) (mad).
Stubblefield has been one of the
mathematicians that have contributed their knowledge and
research, in trying to determine if odd perfect numbers exist. As a result, he has found a new
lower bound for odd perfect numbers, 10^50 (lower, 211-222).