Our Team

Board of Directors

Timothy Michael Kral 

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.  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.

Dr. Joseph Brown

Dr. Joseph Brown, Graduate Diversity Recruitment officer, and Associate Director, Diversity & First-Gen Office at Stanford University.  Joseph  works to support new generations of scholars that reflect the diversity of intellectual perspectives in society. He develops programs tailored to the specific needs of students from a variety of backgrounds and guidance toward the completion of their academic goals. Joseph has a Ph.D. from Stanford University with research work under the tutelege of  Dr. Claude Steele.

Kenneth Goldman

Ken served as chief financial officer of multiple public and private companies and helped take three companies public. Ken's experience includes board director, audit committee chairman and financial advisory roles at more than 40 corporate boards, of which over 10 have gone public. Ken currently serves on the board of directors of NXP Semiconductor, Trinet, RingCentral, Zuora, GoPro and the SASB Foundation; nonprofit boards include Lucile Packard Children's Hospital and the RFK Human Rights Board. Ken holds a BS in electrical engineering from Cornell University and an MBA from Harvard Business School.

Mai Le

Mobile Engineering Leadership. An innovator with laser-sharp focus on successful executions and delivery. Built diverse, high-performance teams at Uber, Yahoo, Walmart, Microsoft and Symantec. At Yahoo, drove the transition from legacy products and platforms to a consolidated next-generation platform technologies with a fresh user experience across markets, partners and devices.

David Verdugo Ed.D. 

Dr. Verdugo was named the Association of California Administrators (ACSA) Region XIV Superintendent of the Year. He received the California State University, Long Beach Outstanding Superintendent Leadership Award in 2012 and the ALAS, Association of Latino Administrators and Superintendents, National Outstanding Educator Award in 2013. In 2020, Dr. Verdugo was inducted into the University of Southern California USC Rossier School of Education “Hall of Fame."

Christina Bui

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, and was awarded “Most Influential Women in Business” in 2016 and 2017 in the Bay Area by the San Francisco Business Times. 

Randall Martinez

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.   

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