Testerman Advisory

Scale new heights,  without the turbulence.

Achieving sustainable growth, without sacrificing stability.

Testerman Advisory, LLC is a boutique consulting firm offering customized advisory services in sustainable finance, any form of financial service which integrates environmental, social and governance (ESG) criteria into business or investment decisions; as well as a full range of international capital markets services for emerging market-based companies and financial institutions.

Our Services


ESG & Sustainability Advisory

Treasury & Capital Markets Services 

About Us

Gregory Testerman, CEO

Greg’s thirty-year career in international Corporate & Investment Banking spans four continents and all of the world’s major banking centers and capital markets.


After training at JP Morgan Chase’s New York headquarters and in Europe, he worked seventeen years with Banco Santander throughout Europe, Asia, and Latin America, including as General Manager and Country Manager of Santander’s bank in Japan - with responsibility for Southeast Asian markets - and General Manager for Santander’s Miami branch, responsible for correspondent banking, trade finance, and structured trade throughout Latin America. He spent nine years as Treasurer and Senior Managing Director of Capital Markets for the Foreign Trade Bank of Latin America (“Bladex”), a supranational development bank.


Throughout his banking career, Greg has specialized in building new businesses, and turning around challenged ones. He speaks English, Spanish, and French, and has served on several boards of directors internationally.

Greg is Chairman of the ESG & Sustainability Committee at the U.S. Chamber of Commerce of Vietnam. He also serves on the Capital Markets and Financial Services Committee, and the Banking Subcommittee.

Alexa Yiğit, Senior Advisor

Throughout her career, Alexa Yiğit has focused on bridging corporate and investor perspectives on sustainable long-term business performance and financially material ESG issues across the capital markets. Alexa advises corporates and financial institutions on the evolving sustainable finance market and engages with corporate executives to align their ESG strategies with stakeholder expectations. She also provides valuable insights on signaling long-term sustainable performance to investors through her thought leadership. 

Alexa was part of Morgan Stanley’s Global Sustainable Finance Product & Solutions division, where she delivered innovative sustainable investing products and solutions for the firm’s clients. She designed and implemented sustainability strategies that considered environmental, social and governance factors, while seeking to achieve market-rate financial returns.

Alexa leverages her background in Capital Markets, Global Corporate Investment Banking and Credit Risk through her work as Relationship Manager for Santander Bank N.A.’s Telecom, Media, and Technology sector and as a Business Manager in DCM Fixed Income Strategy for the Royal Bank of Canada in New York.

Throughout her advisory and banking career, Alexa has specialized in ESG integration and disclosure strategy, as well as product development. She speaks English, Spanish, and French, and in 2020 Reuters named her as one of the 'Thought Leaders Leading the New World Order'.

What Our Clients are Saying

"Greg and the team's advice on the importance of maintaining financial discipline during the start-up phase was invaluable in establishing operational stability early on."

— Damian Quinn, Managing Director, Sai Kutsu Ltd., Hong Kong

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