Practice Leader, ESG Services

Mary Tressel

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Meet Mary

Mary successfully led Armanino's B Corporation certification journey, establishing Armanino as the largest B Corp accounting firm globally. She brings the deep experience of responding to one of the most complex environmental, social and governance verification frameworks to her clients. Serving as a trusted advisor, Mary gives organizations the confidence to set and attain ambitious ESG goals.

Mary is an award-winning and results-oriented strategy, project management and communications professional with experience in the professional services, healthcare, financial services, technology and nonprofit sectors. She leads Armanino’s ESG Services team and the firm’s corporate foundation, delivering on Armanino’s purpose to be the most innovative and entrepreneurial firm that makes a positive impact on the lives of its clients, people and community. She introduced innovative programs such as Volunteer Vacations, Financial Literacy and Virtual Volunteering to drive employee and community engagement.

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Professional History


  • Moore Global ESG Collaboration Group
  • Tri Valley Nonprofit Alliance


  • Armanino Foundation, Executive Director and Board Member
  • Shelter, Inc., Development Committee Member


  • Saint Mary’s College


  • Tressel Communications
  • Lewis & Summers Public Relations
  • Pillsbury Madison & Sutro


Speaking Engagements

  • “Buildings Need to Develop Immunity To Forces And New Realities That Affect Them – How Environmental, Social, And Governance (ESG) Strategies To Create Resilience And Sustainability In Real Estate,” Greenspoon Marder Innovation Summit: Webinar, May 20, 2021
  • “How Environmental, Social & Governance Strategies Create Resilience & Sustainability in Real Estate,” Greenspoon Marder Webinar, June 23, 2021
  • How is the Great Resignation Affecting Operations,” Armanino Webinar: August 12, 2021

Thought Leadership Publications

Industries Served
Mary's Thought Leadership
3 Reasons Why Your Nonprofit Needs to Implement an ESG Strategy
An effective ESG strategy can help your nonprofit prioritize ethical business practices and attract top-tier talent.

November 19, 2021