This paper presents a non-technical exposition of graph theory (more particularly, the theory of directed graphs or digraphs), followed by a survey of the literature on applications of graph theory in ...

The subject of graphical methods for data analysis and for data presentation needs a scientific foundation. In this article we take a few steps in the direction of establishing such a foundation. Our ...

Research: My main areas of interest are: algebraic topology and its applications, graph theory, geometric topology, and applied statistics & decision analytics. Research with undergraduate students: I ...