Invited Talks of a Substantial Nature:

Keynote: Using Learning Technologies to Support Students in Developing Integrated Understanding. The 13th International Conference on Computers in Education, Singapore, November 28th - December 2nd,, 2005.

KeyNote: Supporting Students in Developing Scientific Explanations. MSELA _(Michigan Science Education Leadship Association) Dinner held in conjunction with the 53rd Annual Michigan Science Teacher Association Conference, March 2-4, 2006.

Plenary Speaker: Designing and Implementing Technology-Driven Solutions for Sustaining SMT Reforms: A Partnership Story. Principle Investigator Leadership Institute For Systemic Initiatives, National Science Foundation, Urban Systemic Initiative Programs, Washington, DC, November 15, 2005.

Invite Symposium Speaker: Designing Science Learning Environments to Foster In-depth Understanding of Content and Practices. University of Georgia, Learning and Performance Support Laboratory, Athens, GA, April 18, 2005.

Keynote Speaker: Developing Students Understanding in Chemistry: Connections that Matter. Jahrestagung der Gesellschaft für Didaktik der Chemie und Physik (GDCP) 2003 Chemie- und physikdidaktische Forschung und naturwissenschaftliche Bildung"GDCP-Meeting at Berlin, Jahrestagung in Berlin, September 15.-18, 2003.

Keynote Speaker: New Teaching Practices in Science Education. First International Form on Education, Tianjin Experiment High School, Tianjin, China, Sept 25th - 26th, 2002.

Keynote Speaker: Using Ideas from Learning Theory to Design New Chemistry Materials, Beijing Normal University, Beijing, China, Sept, 2002.

Speaker, National Science Foundation, Instructional Materials Development conference for Principal Investigators, Middle School Science Curriculum Materials: Meeting Standards and Fostering Inquiry Using Learning Technologies, National Science Foundation, Arlington, Virginia, January 26th - 29th, 2003.

Keynote Speaker: Embedding Learning Technologies into Science Curricular Materials. National Research Council Committee on Improving Learning with Information Technology, Palo Alto, California: December 11, 2001.

Guest Lecturer: Shanghai Normal University, South China Normal University, Beijing Normal University, Academic Exchange, Lectures on the use of learning technologies and inquiry in science education, August 4 - 19, 2001.

Keynote Speaker: Technology Tools to Support Students in Inquiry , Invited Symposium in Science Education in Honor of Professor Uri Ganiel, Weizmann Institute of Science, Rehovot, Israel , September, 2001).

Keynote speaker: Advantages and Challenges of Using the WWW to Fosters Sustained Science Inquiry. Keynote Speaker, Educational Uses of World Wide Web, sponsored by Taiwan's National Research Council, National Taiwan Normal University, Taipei, Taiwan, October, 2000.

Seminar speaker: Designing Learning Technologies to Support Extended Inquiry. Weizmann Institute of Science, Rehovot, Israel, January 11, 1999.

Keynote Speaker at the Second Conference on Chemical Education, Designing Curriculum materials to support the learning of science, National Taiwan Normal University, Taipei, Taiwan 11718, March 13, 1999.

Seminar Speaker: Designing learning technologies to support science inquiry. National Taiwan Normal University, Graduate Institute of Science Education Taipei, Taiwan 11718, March 11, 1999

Seminar Speaker: Using learning technologies to support science learning (3 hours presentation), National Kaoshiung Normal University , Kaoshiung, Taiwan, March 15, 1999.

President's Speech at the Annual Meeting for the National Association for Research in Science Teaching: Reflections on the Past Year, Boston, MA, March, 1999.

Keynoter Speaker at the International Workshop on Science Teachers Education: Toward the New Millenium, Using Curriculum Materials to Support Enactment of Extend Inquiry, Technion - Israel Institute of Technology, Technion City, Haifa Israel, January 5 - 6, 1999

Keynote Speaker with Juanita Clay-Chambers, Associate Superintendent of Educational Service and Eddy Green Superintendent, Detroit Public Schools at National Science Foundation Meeting on Systemic Change, Partnerships with Institutions for Higher Education, Washington, D.C., October, 1998.