Bronster graduated from Brown University, where she became fluent in Mandarin Chinese, and then Columbia University Law School in 1982. She went into private practice for Shearman & Sterling in New York City in litigation. She moved to Honolulu, Hawaii in 1988 and joined the firm Carlsmith Ball Wichman Murray Case & Ichiki. That law firm is now known as Carlsmith Ball, LLP.
In 1995 she was appointed as the first woman to hold the office of Attorney General of Hawaii for a full term. During her tenure in the Democratic administration of Governor of Hawaii Benjamin J. Cayetano, she won the state a multibillion dollar Master Settlement Agreement from tobacco companies. In 1997 she led an investigation into abuses by the Kamehameha Schools/Bishop Estate trustees. She was reappointed to a second term by Cayetano but her investigation of Bishop Estate trustees caused her to fall out of favor with the Hawaii State Legislature, resulting in her failed confirmation to a second term by the senate in 1999.:256–257 She was replaced as Attorney General by Earl I. Anzai, who was formerly budget director.
Bronster then became a name partner in the Honolulu-based Bronster Crabtree & Hoshibata, later Bronster Hoshibata.
- "Rising Stars: Part 1". Alumni report on web site. Columbia University Law School. Fall 2002. Retrieved November 30, 2010.
- Samuel Pailthorpe King and Randall W. Roth (March 2006). Broken Trust: Greed, Mismanagement, and Political Manipulation at America’s Largest Charitable Trust. University of Hawaii Press. ISBN 978-0-8248-3014-4.
- "Attorneys: Margery S. Bronster". web site. Bronster Hoshibata. Retrieved November 30, 2010.
- "Special Reports: 1997-1999 Release Dates". Attorney General web site. state of Hawaii. Retrieved November 30, 2010.
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