| 2004: | “Evolutionary Accounts of Religion.” Calvin College Seminars in Christian Scholarship: “Nature in Belief.” July, 2004.
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| 2004: | “History of Science and Religion.” Faculty development seminar, Charleston Southern University. Charleston. April 28, 2004. |
| 2004: | “Science and the Scriptures.” Faculty development seminar, Charleston Southern University. Charleston. April 28, 2004. |
| 2004: | “Some Issues in Faith and Science.” Faculty development seminar, Charleston Southern University. Charleston. April 29, 2004. |
| 2003: | “Being a Faithful Scholar: Tension and Discernment.” Faculty development seminar. Redeemer University College. August 8, 2003.
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| 2000: | “The Body in the Bible: Some questions in biblical hermeneutics raised by the natural sciences.” Invited paper for a workshop on A Theology of the Human Body organized by the Institute for Theological Encounter with Science and Technology, St. Louis. MI. Oct. 20-22, 2000.
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| 2000: | “Reading The Two Books Interactively: Some questions in biblical hermeneutics raised by the natural sciences.” Invited paper for the Third Scripture and Hermeneutics Seminar: After Pentecost: philosophy and theology of language and biblical interpretation. Organized by the British and Foreign Bible Society, August 17-19, 2000. Redeemer University College. Ancaster, On. Canada. |
| 1995: | "Beliefs in Science: The Illusion of Detached Materialism"; invited paper for the Philosophy of Biology Seminar, University of Guelph, October 6, 1995.
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| 1990: | "Background Beliefs in Sociobiology". Combined Faculty Colloquium and Pascal Centre Seminar, 1990. |
| 1989: | "Hierarchy Theory". Natural Sciences Colloquium, Redeemer College, 1989. |
| 1978: | Polaritaets - Umkehr im larvalen Segmentmuster des Erbsenkaefers (Callosobruchus maculatus) nach frueher temporaerer Abklemmung. Seminar at the Zoological Institute. University of Wuerzburg, FRG. 1978. |
| 1978: | The Larval Segment Pattern of Insects as a Model System for the Study of Region-Specific Cell Differentiation. Results and Perspectives of Classical Constriction Experiments Applied in a New Experimental Animal. Seminar at the Max-Planck-Institut fuer Virusforschung, Tuebingen, FRG. 1978.
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| 1978: | Terminale Eibereiche bestimmen das raumliche Segmentmuster. Seminar at the Zoological Institute. University of Heidelberg, FRG. 1978. |
1971:
| Mathematic models for pattern formation during insect development. Institute for Theoretical Biology. State University of Utrecht, N.L. 1971. |
