Business Unit Leaders

Tim Reyes

Cast Products

Vice President, Alcoa Corporation
President, Alcoa Cast Products

Tim Reyes is Vice President of Alcoa Corporation and President, Alcoa Cast Products, responsible for the company’s cast products business comprised of 13 operating locations globally. The business is focused on creating higher-value, differentiated metal products including rolling slab, extrusion and forging billet, foundry alloys, and wire rod which are sold to external and internal fabricators. Tim is also responsible for managing Alcoa’s commodity price risk management team, and he is a member of the London Metal Exchange’s Physical Market Committee. In addition, Tim is a member of the Board of Directors of the U.S. Aluminum Association, the industry trading organization.

Prior to the separation of Alcoa into two independent companies, Tim served as President of Alcoa Materials Management for Alcoa Inc. In this role, he was responsible for the commercial activities related to primary metals, alumina, and bauxite and commodity price risk management and transportation for the Corporation.

Tim joined Alcoa in 1999 as Vice President of Alcoa Materials Management in charge of metal price risk management. He has held various assignments including Director of Alcoa Europe’s metal management group in Lausanne, Switzerland; Senior Vice President of Alcoa Materials Management, responsible for Alcoa’s metal trading activities; and Vice President, Marketing and Sales for Alcoa World Alumina, responsible for various commercial organizations within both Alcoa World Alumina and Alcoa Primary Products, covering smelter and chemical grade aluminas, bauxite, bulk freight and specialty powders.

Earlier in his career, Tim held trading positions with F&S International, a subsidiary of STINNES/VEBA (now EON) and co-founded the Tricor Group, both based in New York City.

Tim currently serves on the Board of the Directors of Purity Zinc Metals, Inc. located in Clarksville, TN. In addition, he has previously served as an industry member of the London Metal Exchange’s Aluminum and Warehouse Committees, as well as the Aluminum Association’s Recycling Committee His nonprofit work included serving on the Board of Directors of the East Tennessee Juvenile Diabetes Research Foundation and the Knoxville Botanical Gardens and Arboretum.

Born in Springfield, Massachusetts, Tim graduated from Boston College with a degree in finance. He and his wife, Andrea, have one son, Evan.

Michael Parker


Vice President, Alcoa Corporation
Chairman and Managing Director, Alcoa of Australia Limited
President Refining and Australia Region

Michael Parker is Vice President, Alcoa Corporation, Chairman and Managing Director of Alcoa of Australia, and President Refining and Australia Region.

Prior to the separation of Alcoa Inc. into two publicly-traded companies, Michael held the dual leadership roles leading Alcoa of Australia and the alumina refining business. Michael is responsible for Alcoa’s global alumina refinery portfolio which includes eight refineries in five countries (Australia, Brazil, Spain, Suriname and the U.S.). In Australia he represents the company to facilitate growth opportunities and manages key stakeholder relationships.

Since joining Alcoa Inc. in 1994, Michael has held various management positions in Australia and the United States, primarily focused on Alcoa’s upstream operations in alumina and aluminum. From 2010 to 2015 Michael was Director Business Development and Marketing for Alcoa of Australia. He was responsible for sales, marketing, business development and energy strategy for the Australian operations. From January 2015 he was also Vice President Commercial for Alcoa’s global alumina refining business.

For the three years prior to 2010, Michael worked in Knoxville, Tennessee, as Vice President of Alcoa Materials Management.

Michael is Vice President of the Australian Aluminium Council, Director of Alcoa Corporation Foundation, and Executive Sponsor for the Alcoa Women’s Network. He has previously served as a member of the London Metal Exchange’s Aluminium Committee, was a Director of the Trustee Board for the Alcoa of Australia Retirement Plan and a Director of the Dampier to Bunbury Natural Gas Pipeline.

Michael holds a bachelor's degree in International Business from Griffith University, Queensland.

Martin Briere


Vice President, Alcoa Corporation
President, Aluminum

Martin Brière is Vice President, Alcoa Corporation and President, Aluminum for the new publicly-traded company formed following the separation of Alcoa Inc. He was previously President, Global Primary Products – Canada, Europe and Africa.

In his role Martin assumes operational and financial responsibilities for Alcoa smelting operations globally. He is also responsible for the Smelting Centre of Excellence, which develops, validates and implements best practices in aluminum production for Alcoa smelters.

Martin started his career with Alcoa Inc. in Canada in 2007 as Director, Engineering and Maintenance at the Bécancour Smelter. A year later he was appointed Director, Carbon, Engineering and Maintenance and Regional Leader, Maintenance and Reliability. He took the helm of the Deschambault Smelter in 2010, before being appointed Vice President, Operations for Alcoa Global Primary Products in Canada in March 2012, then named President in August 2012. In June 2014 while based in Geneva, Switzerland, he assumed leadership of Alcoa's aluminum smelting assets in Canada, Europe and Africa. He was appointed President, Global Aluminum in December 2014.

Before joining Alcoa, he held various engineering and management positions at Corus S.E.C. and Duchesne et Fils ltée.

In addition to his responsibilities within Alcoa, Martin is a member of the Board of Directors of the Aluminum Association of Canada. He also represented Alcoa as part of the Future Leaders Team of the World Business Council for Sustainable Development (WBCSD) in 2008. The group brought together 25 upcoming leaders with high career potential from businesses around the world.

Martin holds a degree in chemical engineering from McGill University in Montreal.

Simon Baker


Vice President, Alcoa Corporation
President, Energy and the European Region

Simon Baker is Vice President of Alcoa Corporation and President of Energy and the European Region. He was named President of Energy and European Region in 2015 prior to Alcoa Corporation’s separation from Alcoa Inc. In his role as Regional President, Simon develops the Company's interests in Europe through interactions with government and regulatory officials, industry associations and other stakeholders. As President Alcoa Energy, Simon has global oversight of Alcoa's energy assets and responsibility for energy matters within the corporation.

Simon joined Alcoa Inc. in 2006 as Energy Director responsible for formulating energy purchasing strategies, buying energy and contract management and managed Alcoa's energy professionals based in Spain, Italy and Norway before stepping into his global role.

Prior to joining Alcoa, Simon was Director of Business Development for the European operations of International Power, responsible for merger and acquisition activities, commercial development, and strategic partnerships. Other positions included nuclear power engineer, energy trader, fuel purchasing manager, sales and marketing director, vice president structured trading and business development director.

He has a bachelor’s degree in physics from Liverpool University, a Management diploma from Oxford University, and an MBA from the Bradford University School of Management in the UK. He is a British citizen and currently lives in Switzerland.

Garret Dixon

Vice President, Alcoa Corporation
President, Bauxite
Perth, Australia

Garret Dixon is Vice President, Alcoa Corporation and President, Bauxite responsible the Corporation’s global bauxite operations.

He was President of Alcoa Mining when the business unit was part of Alcoa Inc. Prior to this appointment in 2015, Garret headed up the Global Mining Centre of Excellence after joining Alcoa Inc. in 2013. In this role, Garret led a team focused on Alcoa's bauxite mining operations with a goal of achieving more efficient and effective mining operations.

Garret is an experienced contracting and mining executive. He has more than 35 years experience in the civil and mining contracting and resources sectors. Garret previously was the Managing Director & CEO of Australian company, Gindalbie Metals Ltd. At Gindalbie he led the company through the transition from explorer to a development company and to iron ore producer. The company grew from a market capitalization of $A250 million in 2006 to $A1,250 million in 2011 and was admitted to the S&P ASX 200 Index. This appointment followed positions as Managing Director of a logistics company and 18 years at contract miner HWE Mining where he headed mining operations in Australia and internationally.

Garret completed his bachelor’s degree in civil engineering from the University of Adelaide, South Australia in 1980. He later earned his master’s in business from the University of Western Australia, Executive MBA program.

Garret and his wife, Blair, live in the city of Perth, Australia with their two children Kate and Harry.

Ed Hemmersbach

Rolled Products

President, Alcoa Rolled Products
Newburgh, Ind.

Ed Hemmersbach is President of Alcoa Corporation’s Rolled Products business, which produces flat-rolled aluminum for food and beverage cans, aluminum bottles and lithographic sheet. The business draws on the capabilities of Alcoa Corporation’s rolled products plants in the US and Saudi Arabia.

Ed joined Alcoa Inc. in 2001, and he has held various management roles during his 15-years tenure with the company, which separated into two publicly traded companies in November 2016. Most recently, he served as President of Alcoa Global Packaging (AGP) with accountabilities for business in the US, China, Russia, Brazil, and Saudi Arabia with approximately $3 billion (US) in annual sales. Prior to that, he was Vice President, Operations for AGP, and previously was Vice President of North American Operations for AGP and Location Manager, Warrick Operations.

Prior to joining Alcoa Inc., Ed was employed by Commonwealth Aluminum (currently Aleris) in various roles in management, engineering, maintenance, procurement and scrap metal blending.

Ed graduated Magna Cum Laude with a bachelor’s degree in Mechanical Engineering from Rose-Hulman Institute of Technology.  He is a licensed professional engineer in the State of Kentucky.

He is a Member of the Board of Managers of Ma’aden Aluminium. He also serves as a director for the Alcoa Foundation and the Alcoa Employees’ Political Action Committee. He also volunteers as a board member for the Indiana Manufacturer’s Association and is a previous board member of the Indiana Chamber of Commerce.