His early work in algebraic topology and low-dimensional complexes led to an interest in combinatorial group theory. The study of free groups led naturally to trees. The trees then led him astray to functional analysis, harmonic analysis, integral geometry, and potential theory. In his spare time he is active in politics, and is national chair of the liberal political group Americans for Democratic Action.
His early work in algebraic topology and low-dimensional complexes led to an interest in combinatorial group theory. The study of free groups led naturally to trees. The trees then led him astray to functional analysis, harmonic analysis, integral geometry, and potential theory. In his spare time he is active in politics, and is national chair of the liberal political group Americans for Democratic Action.
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