Mark E. Haddad was a partner for 26 years at Sidley Austin LLP, where he served as co-chair of the firm’s Supreme Court and Appellate practice. He served as a law clerk for Associate Justice William J. Brennan, Jr., of the United States Supreme Court, and for the Hon. Louis H. Pollak of the United States District Court for the Eastern District of Pennsylvania. He earned his JD from Yale Law School, where he was editor-in-chief of the Yale Law Journal. He is a Rhodes Scholar and received his MA from Oxford University with first class honors in Philosophy, Politics, and Economics, and his AB with honors and distinction in History from Stanford University.

Haddad has argued cases in the United States Supreme Court, in the supreme courts of four states, and in federal and state appellate courts throughout the country. His matters have involved the impact of federal constitutional, statutory and regulatory provisions on individual rights and business liability, and have arisen in a variety of areas, including administrative law, antitrust law, constitutional law (commerce clause, due process, equal protection, First and Eighth Amendments, federalism and preemption), intellectual property, products liability and professional responsibility. He has been recognized as a leading lawyer by many references, including Chambers USA, Benchmark Litigation, The Legal 500 US, and Super Lawyers.

Haddad speaks on the Supreme Court at law schools, conferences and roundtables, and in response to press inquiries. His comments on the constitutionality of methods of execution were featured by Bill Moyers on billmoyers.com and by Nina Totenberg on NPR. He led interviews with California Supreme Court Justices Mariano-Florentino Cue ´llar (2017), Leondra Kruger (2016), and Goodwin Liu (2015) at conferences hosted by the Institute for Corporate Counsel at the USC Gould School of Law, and with Associate Justice Antonin Scalia (2009) at a meeting sponsored by Town Hall-Los Angeles. “Bring Down the Walls,” a recollection of his clerkship with Justice Brennan, appears in The Common Man as Uncommon Man: Remembering Justice William J. Brennan, Jr., at 1-2, E.J. Rosenkranz & T. Jorde, eds. (NYU: Brennan Center for Justice 2006).

Haddad has received awards from the ACLU Foundation for Southern California (in 2017 and 2003) for pro bono appellate work in the areas of immigration rights and criminal justice reform, and from the National Association of Protection and Advocacy Systems (2001) for the protection of the rights of persons with disabilities. Haddad’s work also has contributed to Sidley’s recognition for pro bono service, including in 2016 and 2015 as Law Firm of the Year for pro bono service by Public Counsel and by the Asian Americans Advancing Justice-Asian Law Caucus, respectively. He is a member of the Boards of Directors of Public Counsel and of Town Hall-Los Angeles.