Carl W. Helstrom (1925–2013) was one of the earliest pioneers in the field of quantum information theory.
He has written a textbook which has been widely read by experts in quantum information theory.
On leave during the 1963–1964 academic year, he lectured in the Department of Engineering, University of California, Los Angeles.
From 1971 to 1973 and 1974 to 1977 he was Chairman of his Electrical Engineering and Computer Sciences department, and during the 1973–1974 and 1986–1987 academic years he was Professeur Associé at the Université de Paris-Sud.
For his contributions to communication and detection theory, Helstrom was elected Fellow of the IEEE in 1970.