Guy Lefebvre is Emeritus Professor at the Faculty of Law of University of Montreal, where he served as a professor of international business transactions, business law and transportation law between 1988 and 2021. He continues to work as an Adjunct Professor. 

Recognized as an authority in the field of international business transactions law and the emergence of standards, he is the author of numerous books and articles published in French, English, Portuguese and Mandarin. Founder in 1997 of the Centre for Business and International Trade at the Faculty of Law, Guy Lefebvre has been co-director of the Sino-Canadian Research Centre at the China University of Political Science and Law in Beijing since 2013, which he co-created. His recognized expertise in business law and international education makes him a sought-after speaker on the national and international scene. He has been a visiting professor at several universities and regularly acts as an expert with international institutions.

Dean of the Faculty of Law from 2012 to 2014, after having long held the positions of vice-dean, he was part of the senior management of his University as vice-president of international affairs and Francophonie from 2014 to 2020. Guy Lefebvre has distinguished himself for more than thirty years by working tirelessly and with dedication to the development of international education and by highlighting Quebec's bijural system, all over the world.

Guy Lefebvre has also been involved in several major national and international councils, including the Board of Directors of the Observatory of Economic Francophonie, the Inter-American University Organization, the Canadian Bureau of International Education, the Franco-Quebec Council for University Cooperation and the Quebec Bar Foundation.

His countless contributions have earned him several awards and prizes both in Canada and abroad, including the Paul André-Crépeau Medal of the Canadian Bar Association and the Medal of Merit from the China University of Political Science and Law. He was also named Fellow of the Law Institute of the Chinese Academy of Social Sciences and Honorary Professor of the East China University of Science and Law. Guy Lefebvre is now a retired lawyer of the Quebec Bar, of which he is an emeritus lawyer (Ad. E.) and he is a distinguished member of the Quebec Order of Excellence in Education. He has also received the Gold Award Education Excellence (on behalf of the Faculty of Law) from the Canada China Business Council and the Chinese Ambassador Award for outstanding contributions to the development of China-Canada relations. In recognition of his accomplishments, the China University of Political Science and Law awarded him an honorary doctorate in law (Dr h.c.), the highest honour bestowed by a university for outstanding contributions to society.

Guy Lefebvre has studied at University of Montreal and University College London.