Elizabeth C. Barker


Liz Barker began a five-year term as Vice-Chair and Member of the Canadian Transportation Agency (CTA) on April 3, 2018.

Liz joined the CTA's predecessor, the National Transportation Agency, in 1991 as counsel. She has held several positions at the CTA, including, most recently, Chief Corporate Officer, Senior General Counsel and Secretary. She has worked in all areas of the Agency’s mandate over the years, but has specialized in advising the tribunal in complex dispute adjudications and oral hearings on controversial subjects including rail level of service complaints, a wide range of complex accessible transportation disputes, and ministerial inquiries into marine pilotage and the accessibility of inter-city motor coach services. She has also worked extensively in the development of the Agency’s approach to its human rights mandate, administrative monetary penalties regime, alternative dispute resolution, final offer arbitration, and rail level of service arbitration. She has appeared as counsel before all levels of court, including the Federal Court, the Federal Court of Appeal, and the Supreme Court of Canada, as co-counsel in Council of Canadians with Disabilities v. VIA Rail Canada Inc., [2007] 1 S.C.R. 650.

Liz was a recipient of the Queen’s Diamond Jubilee Medal in 2016 for her work at the Agency, in particular in accessible transportation, the administrative monetary penalties program, and for her leadership of the Legal Services Branch.

Liz received her law degree from Osgoode Hall Law School in 1987 and her B.A. (Honours in Law) from Carleton University in 1984. She has been a member of the Law Society of Ontario since 1989.

Elizabeth C. Barker, Vice-Chair

Mark MacKeigan


Mark MacKeigan began a four-year term as a Member of the Canadian Transportation Agency on May 28, 2018.

He comes to the Agency from The St. Lawrence Seaway Management Corporation, the not-for-profit operator of the federal government's Seaway assets, where he was Chief Legal Officer and Corporate Secretary from 2014.

Mark is not entirely new to the Agency, having served previously as a Member from 2007 to 2014 and as legal counsel on specific files in a contract position during 1996.

His transportation law experience includes six years as senior legal counsel with the International Air Transport Association in Montréal from 2001 to 2007, focusing on competition law, cargo services, aviation regulatory and public international law matters. From 1996 to 2000, he was legal counsel with NAV CANADA, the country's provider of civil air navigation services.

Mark began his legal career in private practice in Toronto. After earning a Bachelor of Arts with highest honours in Political Science from Carleton University, Mark obtained his law degree from the University of Toronto and a Master of Laws from the Institute of Air and Space Law at McGill University. He also holds a postgraduate diploma in European Union Competition Law from King's College London.

He is a member of the Bars of Ontario and the State of New York and is admitted as a solicitor in England and Wales.

Mark MacKeigan

Mary Tobin Oates


After 25 years of public service, Mary Tobin Oates joined the Canadian Transportation Agency on 9 July 2018. As a lawyer, Mary practised in different areas of law, largely in public and administrative law. She appeared before the Pension Appeals Board and the Federal Court of Appeal regarding disability benefits under the Canada Pension Plan and the Old Age Security Act. Mary served as a Board member of the Veterans Review and Appeal Board where she determined eligibility for disability benefits for members of the Canadian Forces and the Royal Canadian Mounted Police. Mary provided legal and policy advice on indigenous issues to the Department of Justice and to Indian and Northern Affairs Canada. She also served as Board member to Tungasuvvingat Inuit, a not-for-profit, charitable organization that provides services to and advocates on behalf of Inuit who live in southern Canada.

Before becoming a lawyer, Mary worked as a technical editor for the Canadian Transportation Accident and Safety Board (now Transportation Safety Board).

Mary received her Bachelor of Arts from Memorial University of Newfoundland and graduated from Osgoode Hall Law School. She has been a member of the Law Society of Ontario (formerly the Law Society of Upper Canada) since February 1997.

Mary Tobin Oates, Member

Marisa Victor


Marisa Victor began a four-year term as a Member of the Canadian Transportation Agency on January 10, 2024.

Marisa is a lawyer and adjudicator with expertise in civil litigation and administrative law. Most recently, she was a Member of the Social Security Tribunal and a Member of the Condominium Authority Tribunal in Ontario. Previously, she was a Vice-Chair within Tribunals Ontario for six years. She has played a leadership role in improving access to justice and in transforming and modernizing several tribunals. A seasoned adjudicator, she has extensive experience in a wide variety of issues including regulatory compliance, consumer protection, professional responsibility, insurance claims, and human rights. As a civil litigator, Marisa has worked on a range of complex, high-profile and sensitive files. She has appeared before every level of court as well as numerous administrative tribunals. Prior to working in the private sector, she began her career as Legal Counsel to the Air India Inquiry.

Marisa received her Bachelor of Fine Arts from York University, a Masters in English from King’s College London, UK, and a joint Master in Environmental Studies and LLB from York University/Osgoode Hall Law School. She has been a member of the Law Society of Ontario since 2006. Marisa identifies as Latinx and volunteers with various legal and arts organizations.

Marisa Victor, Member

Heather Smith


Heather Smith became a full-time Member of the Canadian Transportation Agency on August 27, 2018. Heather was most recently Vice-President, Operations at the Canadian Environmental Assessment Agency. In previous positions, Heather was Executive Director in the Government Operations Sector of Treasury Board Secretariat, and Director General in the Strategic Policy Branch at Agriculture and Agri-Food Canada (AAFC). Heather held several management positions within Justice Canada, as General Counsel and Head of AAFC Legal Services, General Counsel and Head of Legal Services at the Canadian Environmental Assessment Agency, and General Counsel in the Legal Services Unit of Social Development Canada/Human Resources and Skills Development Canada.

Heather also served as legal counsel at Environment Canada Legal Services and Manager of the Canadian Environmental Protection Act Office at Environment Canada. Heather holds a B.A.(Hons.) from the University of King's College and an L.L.B. from the University of Toronto. She has also earned the Chartered Director (C.Dir.) designation from the McMaster/DeGroote Directors College.

Heather Smith, membre

Lenore Duff

Temporary Member

Lenore Duff returned to the Canadian Transportation Agency after having served as a temporary Member from 2018-2020. She is a former public service executive with 28 years of service with the Government of Canada whose positions included Director General, Strategic Initiatives at the Labour Program; Director General, Surface Transportation Policy at Transport Canada; and Senior Privy Council Officer supporting the Social Affairs Committee of Cabinet. Her primary focus throughout her career has been on the development of policy and legislation across a broad range of economic and social policy areas.

As Director General, Surface Transportation Policy at Transport Canada, Lenore was responsible for developing policy options and providing advice on strengthening the freight rail liability and compensation regime, as well as on reforming freight rail provisions as part of the recent modernization of the Canada Transportation Act. At the Labour Program, her work included leading the development of a series of legislative initiatives designed to enhance protections for federally regulated employees. Prior to that, Lenore was responsible for the development of policy initiatives related to income, employment and disability.

In the course of her career, Lenore has also had the opportunity to conduct consultations with a broad range of industry, civil society and government stakeholders to inform the development of policy and legislation.

Lenore earned both a Bachelor of Arts (Honours Sociology) and Master of Arts in Sociology from Carleton University.

Lenore Duff, temporary Member
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