During the 1998-99 academic year he gave the Institute of Physics Schools Lecture 43 times in various venues in England, Scotland, Wales and the Channel Islands to a total audience of about 9,800 people, mostly in the 15 - 19 age group.
In January 2001, Kalmus gave the named "Cockcroft and Walton Lectures" in India, as part of an exchange programme between the Institute of Physics and the Indian Physics Association.