1982:

Dendrochronology and archaeology in Europe. Workshop of the European Science Foundation (ESF). Hamburg, Germany, April 28-30.

Midt- og nordskandinavisk historie og kultur. Trondheim, Norway, June 21-23. Oral presentation: Datering av gammelt bygningsmateriale fra Trondheim ved hjelp av årringmålinger.

Røykstoveseminar, Voss. August 2-3. Oral presentation: Dendrochronology.

Nordic meeting organised by Norsk Hydrologisk komite. Oslo, September 14. Oral presentation: Dendrokronologiens nyttbarhet. Årringstudier med lange kontinuerlige tidsserier.

1984:

International course on wood conservation technology. Trondheim, Norway, July 18-28. Oral presentation: Dendrochronology.

Third Nordic Conference on the application of scientific methods in archaeology. Mariehamn, Åland Finland, October 8-11. Oral presentation: Dendrochronological investigation in Norway.

1985:

Dendrokronologi og kunsthistorisk forskning i norsk middelalderkunst. Bergen, Norway, August 19-20. Oral presentation: Presentasjon av dendrokronologisk virksomhet i Norge i dag.

1986:

Dendrochronology around the Baltic. Joensuu, Finland, August 27-30. Oral presentation: Comparison of tree-ring chronologies from southern Norway.

1987:

4th Nordic conference on the application of scientific methods in archaeology. Haugesund, Norway, October 7-11. Oral presentation: Dendrochronological evidence of the origin and development of the town of Trondheim.

1989:

Dendrokronololgisk seminarium om datering av tømmerhus. Østersund, Sverige, May 24-25.

1990:

Climate of the northern latitudes: past present and future. International symposium, Tromsø, Norway, April 2-4. Oral presentation: Tree-rings as climate indicators.

Tree-rings and environment. International dendrochronological symposium. Ystad, Sweden, September 3-9. Oral presentation: Network of tree-ring chronologies.

1991:

International tree-ring seminar, Tartu in Estonia, September 2-5. Oral presentation: Dendrochronology and archaeological excavations in Trondheim, Norway.

Dendrochronology and the investigation of buildings. International seminar, Oslo, Norway, November 1-2. Oral presentation: Dendrochronology and building construction.

1992:

National symposium about the Norwegian contribution in the IGBP-project: "Past global changes" (PAGES). Solstrand hotel, Bergen, Norway, November 9-10. Oral presentation: Tree-rings of Scots pine (Pinus sylvestris (L.)) as climate indicators.

1993:

Dendrokronologi i Norge. Seminar at Arkeologisk museum, Stavanger, Norway, April 22-23. Oral presentation: Årringkronologier i Norge.

Forum for friluftsmuseer. Seminar på Trøndelag folkemuseum. Sverresborg, Trondheim, August 26-27. Oral presentation: Dendrokronologiske undersøkelser som middel for sikker datering.

Nordic symposium of Holocene tree-line oscillations, dendrochronology and palaeoclimate. Skibotn, Norway, September 6-11. Oral presentation: Short dendro-series from northern Norway.

Dendrochronology around the Baltic. International symposium in Copenhagen, Denmark, November 18-21. Oral presentation: Presentation of some dendrochronological dating projects in Norway.

1994:

Advances in European dendrochronology. International dendrochronological meeting. Travemünde, Germany, September 14-18. Oral presentation: Dendrochronological dating of medieval excavations in the city of Oslo, Norway.

1995:

Geological winter meeting, Trondheim, Norway, January 7-8. Oral presentation with Gunhild Skjærvø: Årringkronologiske studier av norske stavkirker.

"Nydal-symposium." A symposium held at the retirement of Professor Reidar Nydal, the former leader of the Radiocarbon dating laboratory in Trondheim. November 2-3. Oral presentation: Dendrokronologiske dateringer fra middelalderen.

1996:

Introduction of the TSAP-program. Heidelberg, Germany, February 28 -March 2.

1999:

Eurodendro ’99. International conference on European dendrochronology. Malbork, Poland, September 22-26. Oral presentation: Dating of Urnes Stave Church and its predecessors.