• Calvyn Gardner
    Calvyn Gardner
    Co-Chairperson and Co-Chief Executive Officer

    Before founding Sigma Lithium, Calvyn spent over 20 years holding executive positions at junior and major global mining companies. He was co-founder and managing partner of Hardac Investments, a private equity firm focused on investing in junior mining companies in Africa. Hardac’s major co-investors included Lazare Kaplan International in New York (one of DeBeers’ largest customers in the US) and Mvelaphanda Holdings (South Africa’s largest Black Economic Empowerment Group) in Johannesburg. Calvyn was also General Manager of Operations at Highveld Steel and the CEO of Trans Hex Group. He has an MBA from the University of South Africa and a Bachelor of Science Degree in Electrical Engineering from the University of the Witwatersrand.

    Before founding Sigma Lithium, Calvyn spent over 20 years holding executive positions at junior and major global mining companies. He was co-founder and managing partner of Hardac Investments, a private equity firm focused on investing in junior mining companies in Africa. Hardac’s major co-investors included Lazare Kaplan International in New York (one of DeBeers’ largest customers in the US) and Mvelaphanda Holdings (South Africa’s largest Black Economic Empowerment Group) in Johannesburg. Calvyn was also General Manager of Operations at Highveld Steel and the CEO of Trans Hex Group. He has an MBA from the University of South Africa and a Bachelor of Science Degree in Electrical Engineering from the University of the Witwatersrand.

  • Ana Cabral Gardner
    Ana Cabral Gardner
    Co-Chairperson and Co-CEO, Sigma Lithium and Managing Partner and Co-Founder, A10 Investimentos

    Ana Cabral-Gardner is co-chairperson and co-CEO of Sigma Lithium, a Canadian company dedicated to powering the next generation of electric vehicle batteries with environmentally sustainable and high-purity lithium.

    Since 2018, Sigma Lithium has been producing battery-grade sustainable lithium concentrate at its on-site demonstration pilot plant in Brazil’s Minas Gerais region, while executing a sustainability roadmap to support decarbonization and reach net zero emissions by 2024. Sigma Lithium is traded on the Nasdaq and Toronto Stock Exchanges as SGML.

    Ana is also a managing partner and co-founder of A10 Investimentos, a Brazilian private equity boutique focused on sustainable investments and M&A advisory in consumer healthcare. The A10 FIA Proprietary Fund is the controlling shareholder of Sigma Lithium, one of the largest hard rock lithium companies in the world.

    Ana has over 25 years of experience as a senior banker at global investment banks in New York, London, and Sao Paulo and has over 15 years of experience as a venture capital investor. Prior to founding A10, Ana was head of Latin American Capital Markets at Goldman Sachs in New York. She has also held senior positions in investment banking at Merrill Lynch in London and New York.

    As a venture capitalist, Ana was a co-founder of an internet portal sold to GP Investimentos in early 2000. Afterward, she advised several boards of media and technology companies on digital strategies, including: Lojas Americanas.com (later merged with B2W), Turner Broadcasting Latin America and Nova.com (later ViaVarejo.com)

    She holds an MBA degree from Columbia Business School and a master’s in finance degree from London Business School. She currently serves on the Global Board of Advisors of Columbia University Global Centers.

    Ana is one of the 10 original co-founders of Mulheres do Brasil with Luiza Trajano, a leading brazilian businessperson and one of the world´s 100 most influential people. Mulheres do Brasil is the country´s largest advocacy organization with over 96,000 active members, focused on women-oriented policy-making, with branches in 10 countries.

  • Marcelo Paiva
    Marcelo Paiva
    Corporate Finance Director and Board Member
    Marcelo is a co-founder and Managing Partner at A10 Investimentos. He has over 20 years of experience in asset management and investment banking at leading institutions in New York, London and Sao Paulo. Before founding A10 Investimentos, Marcelo was Portfolio Manager at the Mittal Family Office in Sao Paulo, working with private equity, equity and fixed income investments; and Vice President at the UK asset manager Millennium Global in London, also in the management of private equity, equity and fixed income investments, but for the various portfolios managed by the firm, with combined assets under management of over US$15 billion. Prior to that, Marcelo worked in the investment banking divisions of Credit Suisse in London and of UBS in New York, gaining M&A experience in Europe and in the Americas. Marcelo has a Master’s in Business Administration degree from INSEAD, in France, BA in Economics at the Federal University of Rio de Janeiro, and is a CFA Charterholder.
  • Maria José Sallum
    Maria José Sallum
    Chief Sustainability Officer
    Maria is a prominent environmental and social responsibility professional in Brazil. She has held a number of roles during her 40-year remarkable technical career in public service and in the private sector. In public service, her roles included Director of Sustainable Development in Mining at the Ministry of Mines and Energy and Senior Representative for the Ministry at the National Council for the Environment (CONAMA). She was also the second woman in 60 years to serve as Deputy Minister of Mining and Mineral Transformation at the Ministry of Mines and Energy. Maria has had an active academic career, holding several senior roles at the Federal University of Minas Gerais (UFMG), a centre of excellence for mining and metallurgy research in Brazil, including Head of Department for Mining Engineering. She has a PhD in mineral technology. Since retiring from public service in 2018, Maria has worked as a consultant, advising some of the largest global mining companies on environmental matters in Brazil.
  • Felipe Peres
    Felipe Peres
    Chief Financial Officer
    Felipe has over 24 years of experience working in corporate positions and large multinational companies in the oil, steel, and mining sectors, in a global environment in Brazil and Switzerland. Felipe is a former leader of consolidation and reporting at Vale, where he worked for 14 years and participated in the IFRS adoption of this company. Prior to Vale, Felipe worked for Shell and CSN being in both companies in USGAAP reporting key positions. His main areas of expertise are USA and International accounting, finance performance management, internal controls, process design, and systems design and implementation. Felipe graduated in accounting with honors from Universidade Federal do Rio de Janeiro and has specializations in merger and acquisitions from Chicago Booth University and analytics for business from IMD – Switzerland. Felipe serves as an advisor to the board of the Brazil-Switzerland Chamber of Commerce.
  • Daniel Abdo
    Daniel Abdo
    Business Development & IR Director
    Daniel built his career in finance and has over 20 years experience in private equity, investment banking and consulting. Prior to joining Sigma, he was head of investments at RK Partners, leading a partnership with Cerberus Capital Management for the origination and execution of distressed private equity, real estate, and credit opportunities. Prior to that, served as an investment officer at Angra Infra, a private equity fund focused on infrastructure, where he was responsible for new investments and fund raising. Prior to Angra Infra, he was Vice President and Business Unit Manager of the Investment Banking division of Goldman Sachs in São Paulo, where he led M&A and capital markets transactions in sectors such as consumer, retail, financial institutions and mining. Prior to Goldman Sachs, he was an associate at JP Morgan in London, where he was part of the private equity coverage team across Europe. He holds an MBA from The Wharton School of the University of Pennsylvania and a BS in Electrical Engineering with a minor in Biomedical Engineering from Tufts University.
  • Marina Barnardini
    Marina Barnardini
    Chief Legal Counsel
    Graduated from Pontifícia Universidade Católica de São Paulo, with more than eight years of experience in office and management of legal departments and expertise in M&A, Contracts, Litigation, Compliance, Regulatory, Corporate & Government Affairs, Crisis Management, among others in the Mining, Banking, Food, Agribusiness, Consumer, Oil & Gas and Hospital sectors.
  • Talbot
    Brian Talbot
    Chief Operating Officer