1938
Born to Dr. William Siddon and Rebecca Beeman Langford in New York City.
1959
Earns a Bachelor of Science in mathematics from the Massachusetts Institute of Technology.
1959
Marries Patricia Calyer Langford on September 5.
1960
Achieves a Master of Science in mathematics from Rutgers University.
1963
Obtains a Doctor of Philosophy in mathematics from Rutgers University.
1963
Is a research specialist in the Autonetics Division of North American Aviation until 1964.
1964
Teaches as an assistant professor of mathematics at the Naval Postgraduate School until 1969.
1966
Is a visiting associate at Daniel H. Wagner, Associates in Paoli, PA.
1969
Teaches as an associate to full professor of mathematics at the University of Maine, Orono until 1982.
1971
Receives a Lester R. Ford Award from The Mathematical Association of America.
1971
Is an associate editor of the American Mathematical Monthly until 1975.
1972
Is a visiting associate professor at the California Institute of Technology until 1973.
1976
Is a visiting scholar at the University of California, Berkeley.
1977
Is a visiting distinguished professor at the California Polytechnic State University until 1978.
1982
Teaches as a professor of mathematics and statistics at the California State University, Chico until 2006.
1999
Is the department chair at the California State University, Chico until 2001.