Mari co-founded GlobalGiving with Dennis Whittle, and currently leads the organization. 

In 2011, Mari was named one of Foreign Policy's top 100 Global Thinkers for "crowdsourcing worldsaving." Before GlobalGiving, she worked at the World Bank where she managed and created some of the Bank's most innovative projects including the first ever Innovation and Development Marketplaces, and the first series of strategic forums with the World Bank's president and senior management. Mari also designed a range of investment projects in the Russia reform program, including a residential energy efficiency project, structural adjustment loans, and legal reform project. She currently serves as chair of the board of Guide​S​tar and of the board of DataKind , and APOPO US. In addition to her native Japanese, Mari also speaks Russian, Italian, and French. She has an undergraduate degree in history from Harvard University and did graduate work in Russian and Japanese history and politics at Harvard and Georgetown Universities. Mari also completed the Advanced Management Program at Harvard Business School.