Macey is the 4th most cited legal scholar ever in the world in the field of corporate law.
Macey also serves on the academic advisory board (Comitato Scientifico) of the Associazione Disiano Preite for the study of corporate law (per lo studio del diritto dell'impresa).
In 2000, Macey became a member of the legal advisory committee to the board of directors of the New York Stock Exchange.
In 2001 Macey was appointed a Bertil Daniellson Distinguished Visiting Professor in Banking and Finance at the Stockholm School of Economics.
In 2002 Macey was appointed to the economic advisory board of the National Association of Securities Dealers (NASD).