J. Peter Guthrie is a scientific leader in developing methods for the prediction of rate constants for chemical reactions in solution. He began with studies of the application of Marcus Theory to organic reactions, then developed Multidimensional Marcus Theory to treat concerted reactions in terms of the hypothetical stepwise reactions, and recently developed No Barrier Theory, which allows calculation of the rate constants for a great many reactions in solution with no adjustable parameters.

Peter Albertus Hacquebard. The glorious colours of Ottawa's springtime tulips and a man interested in internals of coal seams appear to have little in common. Yet among the postwar transplants from the Netherlands in that city, one of the most successful has been Peter Albertus Hacquebard, born in Rotterdam and educated at the University of Leiden. After a brief flirtation with the oil industry, he joined the Geological Survey of Canada in 1948 and was put in charge of the newly formed Coal Research laboratory at Sydney, Nova Scotia. Since then he has poured out a steady stream of contributions of high scientific merit. His researches in palynology led to the first recognition of coal of Carboniferous age in western Canada. He has made outstanding contributions to the revision of the nomenclature and classification of coal and in the field of coal petrography. His work on age determination and correlation of coal seams by petrographic and spore analysis, the mechanism and causes of spontaneous combustion in coal, and his contribution to the understanding of stress relief 'bumps' in coal mines have earned him an international reputation. He is past Head of Coal Research Section at B.I.O. in Dartmouth, NS and retired in 1983. Presently holds the position of Emeritus Research Scientist.

Ian Halliday, in his original research over nearly thirty years, has shown initiative and brilliance, combined with the qualities of versatility and leadership. He was the first to identify the auroral green line in the spectra of meteors and his definitive lists of lines in meteor-shower spectra are used internationally. He has conducted significant field work at Canadian meteor craters, and his camera network on the Canadian prairies resulted in the recovery of the INNISFREE meteorite. This is the third meteorite in the world collection with an instrumentally determined orbit, and the main mass was actually located by Halliday personally. Data from the camera network (published in 1989) have been used internationally as establishing the present rate of arrival of meteorites on the Earth.