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Mary Jane McQuillen

Mary Jane McQuillen

Portfolio Manager, Head of ESG
30 Years experience
35 Years at firm

"We believe that social and environmental issues are also sector-relevant business issues."

Mary Jane is a Portfolio Manager on the Sustainability Leaders Strategy and the Head of ESG at ClearBridge Investments. She joined the firm in 1996 and has 30 years of investment industry experience.

Mary Jane has been with the ESG Investment program since 1996.  She began her tenure as a Business Unit Analyst at Smith Barney, before merging with Citigroup Asset Management, and then rebranded as ClearBridge Investments.  While at Citigroup, she served as a Senior Research Analyst for sustainable investment strategies and became a Portfolio Manager on ClearBridge's ESG investment strategies in 2009.

Mary Jane serves on the Board of Directors for Net Impact. She also serves on the Global Impact Investing Network (GIIN) Advisory Committee for the Listed Equities Working Group.

Mary Jane received an M.B.A. in finance from Columbia Business School and a B.S. in finance from Fordham University.

Experience

  • 30 years of investment industry experience
  • Joined the firm in 1996
  • Member of the Board of Directors, Net Impact
  • Member of the Advisory Committee of the Global Impact Investing Network (GIIN) Listed Equities Working Group
  • M.B.A. in finance from Columbia Business School
  • B.S. in finance from Fordham University

Perspectives

  • Balancing AI Opportunity and Execution Risk
    Sustainability Leaders 3Q26: Portfolio positioning remains centered on high-quality compounders while selectively adding AI beneficiaries, power infrastructure exposure and software businesses with durable growth or lower disruption risk.
  • Sustainability Is a Gating Factor for AI
    AI and data centers dominated an invigorated Climate Week; their development increasingly depends on managing power, water and community impacts.
  • Diversifying AI Buildout Exposures
    Sustainability Leaders 2Q26: We are maintaining overweight positions in semiconductors, industrials, utilities and materials where we are constructive on “picks and shovels” in the AI infrastructure buildout.
  • Materiality Drives Stewardship Insights
    ESG Investment 2Q26: Active stewardship on youth safety, content moderation and disclosure can help assess whether social media companies are managing emerging legal, reputational and operational risks effectively.
  • Materiality Drives Stewardship Insights
    ESG Investment 1Q26: ClearBridge’s engagement priorities reflect evolving risks and opportunities in decarbonization, climate adaptation, human capital, critical minerals, governance and responsible AI/data governance.
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