Veridien pic 1.jpg


Delivering exceptional risk adjusted returns, while helping drive energy efficiency and global decarbonization.



We believe climate change is

both a major threat to global economies and a significant investment opportunity.


Strong relative outperformance and an asymmetric risk profile can be achieved by investing in companies well positioned to benefit from this megatrend. 


Reducing greenhouse gas emissions and increased energy efficiency is driving new innovation and broad-based economic opportunity.


Our goal is NOT to simply invest in

low emission companies, but instead to invest in companies with technologies and business models driving global decarbonization.

Global Greenhouse Gas Emissions Sources



Ariane Mahler

Chief Investment Officer & Portfolio Manager 

Ariane Mahler is CIO for Veridien Global Investors and lead portfolio manager for the Climate Action Strategy. Ariane has 33 years of investment experience as a global equity portfolio manager and analyst, focusing much of her time on the energy, utility, mining and technology sectors. In 2015, she launched Carbon Zero, the most ambitious emission reduction fund of its kind. In 2018, she started the Climate Action Strategy, with a dual purpose of delivering exceptional risk adjusted returns, while helping drive energy efficiency and global decarbonization.

Ariane’s career began as an analyst at SG Warburg and finance officer at Bear Stearns. Subsequently, she spent 21 years as a lead or co-lead portfolio manager on global equity and sector focused equity portfolios, the majority of which was spent at Oppenheimer and the France Growth Fund, as well as at Tradewinds and Kopernik Global Investors*. Other portfolio management and analytical experience was at Dresdner Kleinwort Wasserstein, Credit Suisse Asset Management, and La Française. 


Ariane holds a M.S. in Finance from the London School of Economics studying Capital Market Theory under Mervyn King, and a B.A. in Economics, ESSEC (Ecole Supérieure des Sciences Economiques et Commerciales.

*Analyst Consultant for Kopernik Global Investors

  • LinkedIn

Paulus Ingram

Head of Impact & Portfolio Manager

Paulus Ingram is Portfolio Manager and Head of Engagement and Impact at Veridien Global Investors. Paulus has been working with Ariane as a business advisor in the development of the Climate Action Strategy since 2018. 

Paulus has served as a Senior Advisor to the impact-focused Capricorn Investment Group, a $10 billion multi-family office anchored by Jeff Skoll and the Skoll Foundation. He also served as Investment Committee Chair for the Sarona Global Growth Markets PE Fund 2 (mid-market emerging markets private equity impact fund of funds) and as Investment Committee Member for the Secured Accial Impact Lending Fund (impact-focused, tech-enabled investment in fintech lending portfolios in emerging markets). Paulus has advised multinational corporate investors on carbon capture and renewable energy projects in the United States.

Previously, Paulus was Head of Hedge Fund Investments at Dutch pension asset manager APG responsible for a $23B hedge fund program and worked with the Sustainability and Governance team in establishing thought leadership and action for the $500 billion portfolio on climate and impact. 

Paulus is a CAIA charter holder, member the CFA Society of the UK (IMC) and holds a Master of Laws from Vrije University in the Netherlands, Masters in International Finance from University of Amsterdam, B.As in Biology and English Literature from Amherst College and a certificate from Oxford University’s Said School of Business Private Equity Program.

  • LinkedIn

Barney Walker


Barney Walker is a Principal at Veridien.  He is responsible for developing and managing partnerships in North America, Europe and the Middle East.  


Prior to co-founding the firm, Mr. Walker was co-head of global distribution at Strategic Global Advisors. Previously, he was a Partner at Aligned Asset Managers LLC, a portfolio holding company of GTCR, LLC where they provided growth equity capital and distribution expertise to their member firms. Previously, Mr. Walker was a Senior Vice President at Artio Global Investors, LLC (f/k/a Julius Baer Investment Management, LLC) where he shared leadership for new business and client service from 2002-2012, helping grow the firm to over $80 billion. Mr. Walker started his career at Ark Asset Management, Inc. where he worked from 1996-2002 holding various institutional new business/client service roles after spending two years as a junior member of the portfolio team. He earned his BS from Boston College. 

  • LinkedIn

John Dewey


John Dewey is a Principal at Veridien.  He is responsible for developing and managing new partnerships in North America, Latin America and Asia.  


Prior to co-founding the firm, Mr. Dewey was co-head of global distribution at Strategic Global Advisors. Previously, he led Australia-based Magellan Financial Group’s North American business development and client service team where assets grow in excess of $10B. Mr. Dewey’s prior experience also includes serving as a product specialist while at PIMCO, and numerous roles within the Capital Group's institutional business unit, Capital Guardian. Mr. Dewey's previous experience includes serving as treasurer for a publicly traded leasing company and direct lender to venture capital backed technology and life science companies.  Mr. Dewey earned an MBA from Santa Clara University and a BA from University of California, Los Angeles.

  • LinkedIn

Interested in Joining the Team?



320 Boston Post Road,

Suite 180

Darien, CT​ 06820



Click Here to Find Us


NEW FOR WEBSITE Veridien Global Investors - Logo PNG.png
    Back to Top