Jeffrey MacIntosh received a B.Sc. from M.I.T. in 1975, a LL.B. from the University of Toronto in 1981, and a LL.M. from Harvard Law School in 1982. After teaching for one year at Osgoode Hall Law School in 1982-83, Professor MacIntosh moved to the University of Toronto, Faculty of Law, where he was promoted to Associate Professor in 1987, full Professor in 1995, and Toronto Stock Exchange Professor of Capital Markets in 1999. In 1999, Professor MacIntosh also became the Associate Director of the Capital Markets Institute at the University of Toronto, a joint venture between the Faculty of Law and the Rotman School of Management. In addition, Professor MacIntosh spent one year (1987-88) as John M. Olin Fellow in Law and Economics at Yale Law School.
Professor MacIntosh has written extensively on various topics related to corporate and securities law, including minority shareholder rights, the oppression remedy, fiduciary duties, takeover bids, corporate governance, and the choice of jurisdiction of incorporation. More recently, Professor MacIntosh's writings have focused on financing small, high technology companies, with a particular focus on venture capital. Professor MacIntosh was a member of the Ontario Securities Commission Task Force on Small Business Financing which delivered its final report in 1996.