"Presidential Address: "Counting All, Ignoring None: Promoting a Culture of Peace through Education" at the Tenth Triennial Conference of the World Council for Curriculum and Instruction, Madrid, Spain 2001

"Invited Keynote Address, "Unity in Diversity: An Agenda for the 21st Century" at the Annual Conference of the North American Chapter of the World Council for Curriculum and Instruction, San Antonio, Texas, 1999.

""A New Model for Science Portfolios: Assessing Science Learning" at the Annual Convention of the National Middle School Association, Orlando, Florida, 1999.

"Invited Presentation "Science Literacy: Examining American Students' Performance" at the conference on Science Literacy organized by Hiroshima University, Hiroshima, Japan. 1999.

"Invited Presentation "Celebrating International Exchanges" at the occasion of 175 year celebration of Southeastern Missouri State University, Cape Girardeau, Missouri, 1999.

""SCASS Model for Implementing Science Portfolios in Classrooms", at the annual conference of Association for the Educators of Teachers of Science, Austin, Texas, 1999.

""Science Portfolios: How to Use and Score them in K 12 Classrooms", at the annual national convention of the National Science Teachers Association, Boston, 1999.

"Invited Presentation "American Attitudes and Beliefs about Learning and How Affects Instruction", at the TIMSS Policy Seminar, organized by Ohio Department of Education, Columbus, 1998.

""Infusing Technology in Science Classrooms Training of Science Teachers in Summer 1997" at the seventh conference of International Consortium of Research in Science and Mathematics Education, Port of Spain, Trinidad, 1998.

""Authentic Assessment: SCASS Model for Implementing Science Portfolios in Classrooms", a Workshop offered at the Mini conference of National Science Leadership Association, Las Vegas, 1998.

""Pedagogy for Effective Science Teaching and Learning: Learning Cycle in Action", at the Congresso Internacional, La Educacion En El Tercer Milenio, Seville, Spain 1997.

""New Approach for Preparing Inservice Teachers", at the Congresso Internacional La Educacion En El Teacher Milenio, Seville, Spain 1997.

""Disentangling Popular Arguments: Aiming to Motivate Science Teachers and Improving Their Science Learning Environments", at the annual convention of the National Association for Research in Science Teaching conference, Chicago, 1997.

""Portfolio Assessment in Science", a workshop presented at the national conference of the Association for the Education of Teachers of Science (AETS), 1997.

""Science Portfolios: How It Can be Done in Ohio Schools", workshop at the annual convention of the Science Education Council of Ohio (SECO), 1997.

""Science Education Reform in Urban Schools", at the Annual Conference of the Science Education Council of Ohio, Columbus, Ohio. 1996.

""Improving Teacher Education Through Microteaching", at the Region 3 and 4 Conference of World Council for Curriculum and Instruction, Kaoshuing Normal University , Kaohsuing, Taiwan. 1994

"" A Mathematical Model for Ajzen's Theory of Planned Behavior", at the 66th Annual Convention of the National Association for Research in science Teaching, Atlanta. 1993.

""Cincinnati Initiative for Teacher Education", a panel presentation at the First International Education Conference, Cincinnati, Ohio, October 1992.

""A Model for Reforming Schools Through Collaboration" at the Seventh Triennial World Conference of World Council of Curriculum and Instruction (WCCI), Cairo, Egypt, July 1992.

""Restructuring Schools Through Partnerships Between Schools and Teacher Education Colleges", at the Third convention of Science and Mathematics Educators in the Caribbean countries, San Juan, Puerto Rico, February 1991.

""Promises and Problems of Competency Assessment", at the NSTA Area Convention, Reno, Nevada, December 1991.

""Competency Assessment in Science: Promises and Problems", at the NSTA/BCScTA Area Convention, Vancouver, Canada, November, 1991.

""Closing Comments" for Ohio Math and Science Summit: Reform Is Your Business (at the first Business and Education Summit for Science and Mathematics in Ohio), Columbus, OH, March 1991. (Keynote address)

""Teacher Education: Administrator's Dilemma or Opportunities" at the annual Meeting of Association of Teacher Educators (ATE), New Orleans, LA, February, 1991.

""Competency Assessment in Science: The Issues", at the annual conference of SCO/ODE, Columbus, OH, February 1991.

""Exploration of Opportunities in Informal Settings for Synthesis of Teachers Preparation, Exhibit Evaluation, and Research about Learning in Science" a symposium presented at the annual meeting of National Association for Research in Science Teaching (NARST), Atlanta, GA, March 1990.

""New Directions for Improving Teacher Education", at the Second Regional Conference/World Council of at Mysore, India, December, 1989. (Keynote address)

""The Long Term Effect of 200 Programs on Visitor Attitudes and Behavior," at the Annual Convention of the National Association for Research in Science Teaching. San Francisco, Ca, March, 1989.

""Sex Education: Same Problem, Different Solutions in British and American Schools," at the Annual Convention of the National Science Teachers Association. Seattle, Wa, April, 1989.

""Developing Strategies for Changing Student Attitudes," at the Area Convention of the National Science Teachers Association. Columbus, Ohio, October, 1988.

""Learning in an Informal Setting at the Zoo," at the 61st Annual Convention of the National Association for Research in Science Teaching. Lake Ozark, April, 1988.

" "Developing Thinking Skills Through Science Instruction," at the 3rd Annual Conference on Thinking Skills, sponsored by North Central Educational Research Laboratory. Cincinnati, Ohio, 1987.

""Merging Science Education with Industrial Training," at the 33rd Annual Convention of the
National Science Teachers Association. Cincinnati, Ohio, 1985.

""What Research Says About Teacher Preparation," at the 33rd Annual Convention of the National Science Teachers Association. Cincinnati, Ohio, 1985.

""Science and Creativity: A Natural Link," at the Annual Convention of the Ohio Association for Gifted Children. Cleveland, Ohio, 1985.

""Shaping Attitudes of Science Students," at the Regional Convention of the National Science Teachers Association. Charlotte, N.C., 1984.

""Safety in the Laboratory," at the Annual Statewide Staff Development Conference. Columbus, Ohio, 1984.

""Changing Students' Attitudes in Science Classrooms," at the International Science Educators Conference. Winnipeg, Canada, 1983.

""Science Laboratory Safety: Findings and Implications for Teacher Education," at the Annual Convention of the National Association for Research in Science Teaching. Dallas, Tx, 1983.

""Sex, Live Animals, Evolution and Science Teacher: Educational and Legal Considerations," at the Annual Convention of Science Education Council of Ohio. Columbus, Ohio, 1983.

""Religion, Sex, Live Animals and the Science Teacher: Legal and Educational Consideration," at the Annual Convention of National Association of Biology Teachers. Detroit, Mi, 1982.

""Chemical Toxicity and Chemistry in Secondary Schools," at the Annual Meeting of National Science Teachers Association/ Council of State Science Supervisors. Chicago, IL, 1982.

""Using Videotape Vignettes to Train Science Teachers," at the 91st Annual Meeting of the Ohio Academy of Science. Columbus, Ohio, 1982.

""Changing Student Attitudes in Science Classrooms," at the Annual Meeting of the Science Education Council of Ohio. Columbus, Ohio, 1982.

""Legal Responsibilities of a Science Teacher," at the Drive In Conference for Greater Cincinnati Teachers. Cincinnati, Ohio, 1982.

""Science Needs Assessment: A Statewide Approach," at the Annual Meeting of National Association for Research in Science Teaching. New York, NY, 1981.

""Minimizing Liabilities in Science Classrooms," at the Annual Meeting of Ohio Academy of Science. Wooster, Ohio, 1981.

""Needs Assessment in Science Scientific Literacy in the Schools," at the Annual Meeting of the National Science Teachers Association and Council of State Science Supervisors. Anaheim, Ca, 1980.

""Scientific Research for Gifted Students," at the Annual Meeting of the National Science Teachers Association and the Council of State Science Supervisors. Atlanta, Ga, 1979.

""Curriculum Development: A Priority Step," at the Annual Meeting of Muskingum County School Administrators. Zanesville, Ohio, 1979.

""Science Teachers, Engineers, and Counselors: A Winning Combination," at the Annual Meeting of the Affiliate Societies Council. Dayton, Ohio, 1978.

""Hemispheric Brain Functioning: Educational Implications and Challenges," at the Annual Meeting of National Science Teachers Association and Council of State Science Supervisors. Washington, D.C., 1978.