Zsolt Lavicza, The University of Cambridge
Zsolt Lavicza is a doctoral student at the Faculty of Education at the University of Cambridge, England. With degrees in both Mathematics and Mathematics Education, he is presently teaching in a number of different departments at Cambridge, while also being involved in several international research projects. In his doctoral comparative study, Zsolt has examined the use of Computer Algebra System (CAS) technology by university professors in three countries (HU, UK, USA), focusing particularly on issues of teacher conceptions and beliefs, implementation obstacles, and cultural differences.

Chantal Buteau, Brock University
Chantal Buteau is a professor of Mathematics at Brock University in Ontario. Working in an innovative core mathematics undergraduate program called Mathematics Integrated with Technologies and Applications (MICA), she is a practitioner incorporating technology in her teaching. In particular, she has been teaching a first year MICA I course in which environment building technology (e.g. VB.net) is used to explore mathematics concepts and conjectures. She is a researcher in Mathematical Music Theory specializing in topological modeling of melodic structure. Her research projects in Mathematics Education involve undergraduate students' design and implementation of Learning Objects and use of CAS at the tertiary level.

Walter Whiteley, York University
Walter Whiteley is a professor of Mathematics and Statistics at York University, and a member of the graduate programs in Mathematics, Education, and in Computer Science. He is co-coordinator of the Graduate Diploma in Mathematics Education, and an executive member of the Canadian Mathematics Education Study Group. He is also a researcher in Discrete Applied Geometry, working in areas such as Computational Geometry (processing geometric objects in computers), Biochemistry (protein flexibility), Structural and Mechanical Engineering (what built shapes are rigid and flexible). Walter teaches Geometry at both the undergraduate and graduate levels (often to future teachers). He is a long time user of GSP for research and for teaching, often in conjunction with physical (and kinesthetic) models. He is co-investigator in an SSHRC project on the preparation of Elementary Teachers in Spatial Reasoning.

Carolyn Kieran, L'Université du Québec à Montréal
Carolyn Kieran is Professor of Mathematics Education at the Université du Québec à Montréal, Canada, where she has been a faculty member of the Department of Mathematics since 1983. Her primary research area is the learning and teaching of algebra, with a particular focus on the roles played by computing technology. She served as President of PME (1992-95), as a member of the NCTM Board of Directors (2001-04), and is presently a member of the International Programme Committee for ICME-11 (Mexico, 2008). Her recent research projects have involved the use of Computer Algebra System (CAS) technology in the learning of secondary school algebra. The theoretical lens for this work is based on an adaptation of the task-technique-theory framework developed by researchers in France, with particular attention being paid to the nature of the tasks and the classroom discourse developed by teachers.

Nick Jackiw, KCP Technologies
Nick is the Chief Technology Officer of KCP Technologies, and is also the software designer responsible for The Geometer’s Sketchpad®. Moving with the software from the academic environment to the publishing industry, Nick directed Sketchpad product development at Key Curriculum Press from 1990 through 1998, when with others he developed Key Curriculum Press’ software department into a separate company, KCP Technologies, where he presently works. In addition to designing software, he is the chief programmer of several incarnations of Sketchpad, and directs programming staff in other areas. Nick also acts as a software design consultant to KCP Technologies data analysis software group. He works with schools in conducting field-testing and software evaluation, and also represents Sketchpad professionally in research, curriculum development, and professional development contexts. He has been PI and senior scientist on Small Business Innovative Research projects investigating Dynamic Geometry’s impact and potential, and has written numerous articles on the subject.

Kate Mackrell, Queen's University
Kate Mackrell is a doctoral student whose research in mathematics education focuses on the student use of the 3D geometry software Cabri 3D. Prior to starting her doctorate, Kate worked for ten years in mathematics teacher education at the University of Brighton in the UK. Kate has presented Cabri 2+ and Cabri 3D workshops internationally, such as at ICTMT 8 in Hradec Kralove, CabriWorld (Montreal, 2001; Rome, 2004), and at the recent CADGME conference in Pécs, Hungary,.

Nathalie Sinclair, Simon Fraser University
Nathalie Sinclair works in the Faculty of Education at Simon Fraser University in British Columbia, Canada. She teachers undergraduate mathematics courses as well as elementary, secondary, and graduate courses in mathematics education. Her research focuses on the aesthetic dimension of mathematics thinking and learning which she explores in her book Mathematics and Beauty: Aesthetic Approaches to Teaching Children. She also works extensively on the use of dynamic geometry software across the mathematics curriculum, and is currently focusing on developing materials for young learners.

Markus Hohenwarter, Florida Atlantic University
Markus Hohenwarter is presently a visiting professor at Florida Atlantic University where he is working on an NSF-funded project entitled, Standards Mapped Graduate Education and Mentoring. He holds a Master of Science in Teaching, a Master of Applied Computer Science, and a Doctorate in Mathematics Education from the University of Salzburg, Austria. He is the creator and developer of GeoGebra, an open source mathematics education software which joins dynamic geometry, algebra and calculus. Markus will be leading GeoGebra workshops at CCADGME.