From 1954 to 1958, he was at the Defence Research Telecommunications
Establishment in Ottawa, Canada, and from 1958 to 1963
he taught mathematics at the University of Windsor.
Since 1963, he has been a member of the Department of Mathematics
and Statistics at Queen's University in Kingston, Canada,
serving as Head of the Department from 1980 to 1990.
He currently holds the title of Professor Emeritus
at Queen's University.
His research interests include information theory, error probability calculations for digital communications, birth-death processes, and the sampling theorem. He is a licensed Professional Engineer in the Province of Ontario, a Fellow of the IEEE, and a member of several mathematical societies. In 1994, he was the recepient of the Canadian Award in Telecommunications Research. Dr. Campbell is the author of over 65 journal or book chapter publications.