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Shields' first post was at Tulane where he learnt a lot of functional analysis and wrote papers on topological semigroups. He was appointed to Ann Arbor in 1955 and remained there except for two years (1959-61) spent in New York.
Shields worked on a wide range of mathematical topics including measure theory, complex functions, functional analysis and operator theory. F W Gehring described his work in these words
Allen's standards were high, his taste impeccable, and his ideas deep. He was one of the world's most versatile practitioners in the art of applying functional analysis to gain insight on and solve problems of classical function theory. He had a profound effect on the development of this subject through his research and his personal contacts with colleagues and students.
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