Her research has focused on articulating the potential in mathematical ideas of students. History has been an important tool in establishing these alternative approaches. Her recent work with elementary students has focused on the construct of "splitting", establishing it as an independent but complementary idea to "counting." Currently she is co-authoring a multimedia precalculus course incorporating investigations and computer-based software tools. She is a senior editor for Computers and Mathematics Learning in which she co-authored the paper, "A Critique of the Selection of 'Mathematical Objects' as a Central Metaphor for Advanced Mathematical Thinking." Her phone number is (607) 255 1255 and e-mail is jc56@cornell.edu.