Professor Peter Kivisto:
http://www.augustana.edu/x3462.xml
Professor Piotr Sztompka:
http://www.isa-sociology.org/about/presidents/isa-president-piotr-sztompka.htm
Assistant Professor Suvi Salmenniemi:
http://www.utu.fi/en/units/soc/units/sociology/unit/personnel/salmenniemi/Pages/home.aspx
Vice-rector Harri Melin:
http://www.uta.fi/arkisto/sostut/hlokunta/melin/melin.php
You can find the titles of their keynote speeches from here.