I have been a visiting Professor at universities in France, Italy and Israel, have consulted and lectured widely in this country and abroad and published extensively in the area of educational technology. I am the author or co-author of many software environments including The Semantic Calculator, The Algebraic Proposer, M-SS-NG L-NKS, What Do You Do With A Broken Calculator?, The Geometric Supposer Series, The Geometric superSupposer, Calculus Unlimited, Sir Isaac Newton's Games, The Calculus Toolkit, The Function Analyzer, The Newtonian Sandbox, The Function Supposer Series, Div, Grad, Curl & almost All That!, Unsolving..., The Function Family Register, What Shape is That Color?, and the in COMMON Series.
I have a long standing interest in alternative modes of assessment and have edited reports entitled "The Prices of Secrecy: The Social, Intellectual and Psychological Costs of Current Assessment Practice" and "Assessing Mathematics Understanding & Skills Effectively" [available from Educational Technology Center, Harvard Graduate School of Education, Cambridge, MA 02138, USA ]. My most recent major publications are a book-length case study of educational reform entitled "The Geometric Supposer; What Is It A Case Of?" [published by Lawrence Erlbaum Associates 1993] and "Software Goes to School: Teaching for Understanding in the Age of Technology" [published by Oxford University Press 1995 ], a book co-edited with colleagues from the Educational Technology Center at Harvard.

