Hugleiðing í messu Átthagafélags Sléttuhrepps  22. maí 2016

A reflection in a service for former inhabitants in Sléttuhreppur, a district in North-West Iceland, evacuated in the early 1950s.

"History of Mathematics Education" í UNESCO-EOLSS, an Integrated Compendium of Twenty Encyclopedias. Published in a closed website.

Member of the organization committees of the International Conferences on the History of Mathematics Education, held in 2009 in Gardabaer, 2011 in Lisbon, 2013 in Uppsala, 2015 in Turin, 2017 in Utrecht, 2019 in Marseille, 2022 in Mainz, 2024 in Warshaw.

Member of the editorial committees the conference proceedings "Dig Where You Stand" 1, 2, 3, 4, 5, 6, 7.

Participation in  Network for research on mathematics textbooks in the Nordic countries, chaired by professor Barbro Grevholm in Kristiansand. The project is completed.

Co-chair of Topic Study Group 35, on the history of mathematics education, at the International Congress on Mathematics Education (ICME-12) in Seoul, Korea, in July 2012.