Trebarh was the first woman to be appointed the CEO of the Ghana Investment Promotion Centre (GIPC), serving from 2013 to 2017 as well as the first female underground exploration geologist, amidst a 10,000-strong male-workforce mine site in the Ashanti Region.
[3] Her father, Ernest Dumor, is a retired professor of sociology and development studies, a former Electoral Commissioner and founding executive secretary and adviser to the National Identification Authority.
[6][7] Mawuena's maternal grandfather, Philip Gbeho, was the composer of the National Anthem of Ghana and the music master of Achimota School.
She later studied for an MBA in Management and Strategic Planning at the McCallum Graduate School of Business, Bentley College in Waltham, Massachusetts, in 2002.
[10] She was then invited to the Resource Evaluation Department, where she assisted in the generation of three-dimensional computer models of gold deposits in Ghana, Guinea, Tanzania, Zimbabwe and Burkina Faso.
In this role, she conducted a complex quantitative analysis of exploratory drilling data resulting in declaration of 80.4 million ounces of gold reserves at spot price of $300/oz.
Trebarh also worked as an Investor Relations Officer at Ashanti Goldfields, where she was responsible for retaining content expert status on strategic planning and new business development initiatives, acting as primary interface between the company and international investment community, stock exchanges and senior analysts from Goldman Sachs, Merrill Lynch, CIBC, among others.