Jeffrey has written over 90 academic articles, book chapters, and monographs, a majority of which focus on topics related to corporate and securities law, including minority shareholder rights, the oppression remedy, fiduciary duties, takeover bids, high frequency trading, corporate governance, and the choice of jurisdiction of incorporation. The balance relate to the financing of small high-tech firms, with a particular focus on venture capital and government policy in relation to tech start-ups. He is the co-author with Christopher Nicholls of a widely used reference book on Canadian securities law, and a further book on the duties of securities brokers in Canada.

Jeffrey holds a B.S. from MIT, an LL.B. from the University of Toronto, and an LL.M. from Harvard Law School.