The subject "Linear Algebra for Quantum Theory" was first given by me as a course called Quantum Chemistry and Solid-State Theory at the 1958 Summer Institute in Valadalen in the Swedish mountains. It was later repeated in more and more extended form at more than 30 Summer Institutes in Scandinavia under the auspices of Uppsala University, Uppsala, Sweden, and at more than 25 Winter Institutes in Florida under the auspices of the University of Florida, Gainesville, Florida.