Christina Bui - Chairwoman

Christina Bui is the Chief Revenue Officer at Kranz & Associates, a finance consulting and CFO advisory firm.  She holds a bachelor’s degree in Foreign Affairs and French from the University of Virginia and a master’s degree in corporate finance from Johns Hopkins University.  She was awarded “Most Influential Women in Business” in 2016 and 2017 in the Bay Area by the San Francisco Business Times. Christina serves on the Board of Directors of Asian Pacific Fund, Association for Corporate Growth San Francisco, How Women Lead, and University of San Francisco Center for Asian Pacific Studies. She has Co-Chaired the Association for Corporate Growth’s M&A West Coast Conference six years in a row from 2012-2018 and Co-Chaired Women On Boards 2020 Conference in San Francisco in 2017-2018.

Mai Le - Director

Responsible for Customer Obsession - customer care, engagement and support at Uber. Head of Business Platforms, the foundation platform that enables Uber to operate effectively and intelligently at a global scale. Led the engineering organization that creates the core semantics definition of Uber’s businesses and the technologies used to interact with customers for communications, content, sales and customer engagement experiences.

Randall Martinez - Director

Randall Martinez is the chief operating officer for Cordoba Corporation, a California-based multimillion dollar engineering and professional services firm.  With nearly 30 years of industry experience, Randall directs and oversees the statewide operating sectors of the company while maintaining the organization’s position as a nationally recognized leader of public infrastructure development.   He serves as an advisory board member for the Smithsonian National Museum of American History in Washington D.C. as well as a governing board member for the Los Angeles Area Chamber of Commerce and the California-based Resources Legacy Fund. He was appointed by the California Attorney General to the California Energy Commission’s $3 Billion Clean Energy and Jobs Act (Proposition 39) Citizens Oversight Board.  Randall has a degree in business administration/finance from the University of Southern California.  He is licensed in California as a general engineering contractor.

Timothy Michael Kral -  Director

Prior to founding Siembra, Tim was a corporate finance executive for 25 years building, leading and advising corporations through complex capitalizations, expansion, and capital market transactions.  Background in mergers and acquisitions, financial management, contributions leading to improved financial performance, heightened productivity and enhancing operations for various software companies. Tim is originally from Palo Alto, from a family of researchers at Stanford, studied Social Ethics and Political Geography, Windy Hill Prep Academy, an avid surfer, Sealfit enthusiast.

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