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Trailblazing Sustainability: Mary Jane McQuillen’s 07’s Path to ESG Leadership

In this episode of More MPE, hosts Ray Horton and Sandi Wright speak with Mary Jane McQuillen ’07, head of ESG and portfolio manager at Clearbridge Investments, on her journey into sustainable investing, which might not be what you expect. 

Published
February 18, 2025
Publication
Columbia Business
Focus On
Business & Society
Jump to main content
More MPE: Mary Jane McQuillen
News Type(s)
Social Enterprise News
Topic(s)
Business and Society, ESG, Social Enterprise, Tamer Institute for Social Enterprise and Climate Change

About the Researcher(s)

Raymond Horton

Raymond Horton

Frank R. Lautenberg Professor Emeritus of Ethics and Corporate Governance
Management Division

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In this episode of More MPE, hosts Ray Horton and Sandi Wright speak with Mary Jane McQuillen ’07, head of ESG and portfolio manager at Clearbridge Investments, on her journey into sustainable investing, which might not be what you expect.

It began with her experiences as a seasonal park ranger in New York City, where she witnessed firsthand the environmental impacts of oil spills and water pollution. These early experiences, along with influences from National Geographic magazines and Jacques Cousteau, shaped her environmental awareness and determination to address sustainability issues. Her career in sustainable investing started after her undergraduate studies, working with an investment team at Solomon Smith Barney that managed a sustainable fund, which was highly unusual at the time.

McQuillen played a crucial role in defining ESG investing as part of a group of 12 asset managers working with the United Nations Environment Program Finance Initiative. This group coined the term "ESG" in 2004, moving away from the earlier concept of socially responsible investing (SRI). They focused on integrating environmental, social, and governance factors into fundamental analysis, emphasizing that these factors are material to long-term institutional investment.

Throughout her career, McQuillen has faced pushback against ESG investing, often related to misconceptions about performance trade-offs. She emphasizes that ESG integration is not about exclusion but about enhancing portfolio performance through consideration of long-term factors. McQuillen provides examples of successful ESG investments, such as Costco, which demonstrates strong employee practices and operational efficiency, and SanDisk, where engagement on sustainability issues led to improved water management and employee retention.

McQuillen discusses the evolving landscape of ESG investing and notes that the sector is often held to a different standard, partly due to misconceptions about performance and the diversity of ESG approaches.

For aspiring ESG investors, McQuillen highlights opportunities in portfolio management with an ESG focus, emphasizing the importance of understanding companies' long-term strategies and sustainability commitments. She reflects on her career, noting that while it wasn't always easy, the growing body of research supporting the financial benefits of ESG integration has helped validate the approach. McQuillen's experiences demonstrate the potential for a fulfilling career that combines financial performance with positive impact, offering valuable insights for those interested in sustainable investing.

Mentioned in this episode:

  • Mary Jane McQuillen ’07

Thanks for listening!

Subscribe to More MPE wherever you get your podcasts. Visit morempe.com, or drop us a line at socialenterprise@gsb.columbia.edu.

More MPE is co-hosted by Sandi Wright and produced by The Podcast Consultant. Special thanks to executive producer Hannah Slow and student producers Sofia Martins '26 and Dominica Wambold '26.

Learn more

About the Researcher(s)

Raymond Horton

Raymond Horton

Frank R. Lautenberg Professor Emeritus of Ethics and Corporate Governance
Management Division

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