Marla Sokolowski is an internationally recognized pioneer in the search for genetic influences on behaviour. Starting with observations on naturally occurring differences in locomotory behaviour in the fruit fly 'Drosophila', she found that forms of a single gene are responsible for two types of food-seeking behaviour. The gene encodes an enzyme expressed in the nervous system, where locomotory behaviour is generated. Depending upon the animal's environmental situation, one gene form or the other becomes selectively retained in the population. This work is widely considered one of the best and most convincing studies of behaviour and experimental evolution ever done.

Dr. Solomon is one of the world's leading steroid biochemists. Graduates from his laboratory have raised the standard of steroid research in several Canadian universities. He was first to propose the l7a-hydroxy progesterone pathway for estrogen and androgen synthesis in the ovary, and first to identify 20a-hydroxy cholesterol as an intermediate between cholesterol and pregnenolone in hormone biosynthesis. His studies of foetal-placental endocrinology have aided the development of tests for foetal viability. His research on steroid metabolism in several diseases has contributed significantly to clinical science. Dr. Solomon has served a number of academic functions at McGill University. He has accepted scientific responsiblity on international congress committees and councils, on Medical Research Council committees and as a consultant to hospitals and industry. He is currently associate editor of two journals and has been on the editorial board of Endocrinology since 1961. In the last 20 years, he has been working on the biochemistry of peptide hormones and he and his group isolated a new family of peptides which he called corticostatins because they inhibited ACTH acteon at the adrenal gland by competing for binding actes. These peptides also degranulated mast cells with the release of histamine, turned on L-type Ca++ channels had many other intesting physiologic effects. Dr. Solomon obtained the rank of Officer of the Order of Canada, the McLaughlin medal of the Royal Society of Canada and Sarrazin Prize of Quebec clinical Research Society.

Sorin Sonéa, malgré ses charges universitaires et ses nombreuses missions et représentations auprès des milieux scientifiques nationaux et internationaux et auprès des agences et comités de recherches, est demeuré un chercheur très actif qui a déjà une centaine de publications originales à son crédit. Ses travaux sur l'appareil biochimique et génétique de la virulence microbienne, celle du staphylocoque en particulier, lui ont valu une grand notoriété et de fréquentes citations. Il dirige l'un des plus grands centres de microbiologie du Canada où plus de 45 étudiants « gradués » sont reçus chaque année. Son esprit objectif et critique est précieusement utilisé par le « Canadian Journal of Microbiology » dont il est éditeur associé.

Dr. T.L. Sourkes has established an international reputation as an investigator in the difficult field of the biochemistry of abnormal mental states. His research group is among the leading ones in investigation of the metabolism of catecholamines and brain amines and the biochemistry of the psychotropic drugs. Dr. Sourkes has brought to light the implication of brain amines in the etiology of Parkinson's Disease. As cited in the accompanying curriculum vitae he is the author of 126 publications including 2 books as well as chapters in various treatises and reviews and numerous scientific publications. His literary aptitude has made him much sought after in an editorial and executive capacity by numerous journals and organizations. His breadth of knowledge and experience also have attracted many invitations to lecture in America and abroad.

Dr. Mary Spencer is internationally known for her leading studies of the biosynthesis and metabolism of ethylene and for demonstrating its affect on basic cellular mechanisms for energy conservation and utilization. She is equally well known for her many contributions to Canadian science through service on major committees of the National Research Council. Dr. Spencer is currently serving a second term as a member of the National Research Council. She was a member of the Alberta Government Commission on Educational Planning and Canadian delegate to the 15th Assembly of the International Council of Scientific Unions. In 1968 she was awarded a Distinguished Scientist Travelling Fellowship by the National Research Council. She is a highly productive research Scientist and an excellent university teacher.

David Arthur Sprott has done major research in mathematical statistics and in applied statistics. His work on statistical inference in the areas of sufficiency and likelihood is at the forefront of international exchange in these research areas. His work on experimental design is fundamental and is a major contribution to statistical application. He has contributed substantially to the development of mathematics and statistics in Canada - as an individual and as Dean of Mathematics at the University of Waterloo. Because of his outstanding scholarship he has substantial national and international prominence.

Colin Stearn retired to Emeritus status after serving as Logan Professor of Geological Sciences at McGill University from 1968-1993. During this period he was chair of that department from 1969 to 1974 and again from 1980 to 1984. He is co-author of textbooks on regional geology [The Geological Evolution of North America, (3 editions)] and paleontology [Paleontology:the Record of Life]. His research in paleontology has been largely on a group of extinct Paleozoic, reef- building sponges, the stromatoporoids. He has also made major contributions to the study of the fossil faunas of Paleozoic reefs in the Devonian rocks of the Alberta Rockies, and Ellesmere and Bathurst Islands in the Canadian Arctic Archipelago. His Paleozoic reef studies also included the Silurian rocks of the James Bay lowlands. In the seventies he studied the growth and destruction of modern reefs on the west coast of Barbados.

Charles Richard Stelck, Professor of Geology at the University of Alberta, has made outstanding scientific contributions in palaeontology, stratigraphy, palaeogeography, and petroleum geology. His world is the North America of late Palaeozoic and Mesozoic times and his researches into what it was like in those times have ranged from detailed descriptions of micro-organisms of the day to the distribution of the ancient lands and seas. He is a recognized authority on the fauna and flora of Cretaceous rocks and his publications on the palaeogeography of western Canada are classics in their field. In practical terms his work has greatly assisted in the development of petroleum resources in northern British Columbia and the Fort St. John gas field. His students in the University of Alberta have contributed widely and successfully in the petroleum industry and in research institutions.

Dr. Stewart is best known for his work on the angular correlation between the gamma rays resulting from the annihilation of slow positrons with electrons in matter. A pioneer in applying this technique to the momentum distribution of electrons in metals, he has continued this study with increasing precision for many years and is now an acknowledged world authority on electrons in solids and liquids. Dr. Stewart has also done important work in the field of neutron inelastic scattering by crystals, and has made some of the standard measurements of the neutron cross-sections of ortho- and para-hydrogen, measurements of prime importance in the theory of nuclear forces. More recently, he has studied zero-point bubbles in solid and liquid helium.

Jane Stewart, Professor, Department of Psychology, Concordia University, has made important contributions to knowledge of the neural and hormonal control of appetitive motivation. Her studies of the role of Pavlovian conditioning and the stimulus properties of drugs have led to important advances in addiction theory. She has provided critical insights into the progressive sensitization caused by repeated experience, stress and various drug treatments. She has also significantly advanced our understanding of the effects of perinatal gonadal hormones on the development of brain areas not normally associated with sexual behaviors and the influences that such effects may have on play behaviour, exploration and responses to stimulant drugs.

Professor Stewart ranks as one of Canada's leading physical-organic chemists. His work on oxidation of organic compounds has contributed in a major way to our understanding of the mechanisms associated with this important reaction and has culminated in an important book under his authorship. His beautifully-executed measurements on the protonation of weak bases in strongly acid solution have provided a great deal of reliable acidity function data and have extended our understanding of the concept of acidity. In this same general area, he has also made important pioneering studies which show how the very useful acidity-function scale may be extended to strongly basic media.