Some information on John Adams from the back cover of a book on him and his works:
The John Adams Reader: Essential Writings on an American Composer is the first full-length book in English devoted to the work of John Adams, among the most frequently performed living American composers in the sphere of classical music. Sometimes called America's "composer laureate," John Adams has proved to be that rare bird - an enduring, if often controversial, figure in contemporary art music.
Although branded a minimalist early in his career, Adams has composed in many styles and forms, from opera, choral, and orchestral pieces to multimedia stage works and tape and electronic composition.
So, branded a minimalist, but obviously not a minimalist in his total output. This book sounds as though it would be worth getting hold of, and checking out the different viewpoints on the man.