The judge on the front lines of culture war

The tribunal likely to continue taking on tough issues with Marshall at the helm. Like John Adams, a figure Marshall admires, her willingness to confront challenges and unpopular causes sets her apart, says Joe Vrabel, a lawyer who has known Marshall since she was in private practice. "She shows an ability to do what is right no matter what public opinion says."

Marshall came to the US as a graduate student in 1968 and received a law degree at Yale Law School. She was admitted to the bar in 1976, a year before gaining US citizenship. She quickly became a role model for women - as an early member of the Women's Bar Association in the late 1970s and later by raising money for a major gender-bias study in Massachusetts.

When she was appointed chief justice in 1999, she became the first woman - and immigrant - to lead the state's judiciary, the oldest continuously operating appellate court in the Western Hemisphere.

Marshall has been married to retired New York Times columnist Anthony Lewis for the past two decades. "When Margy and Tony got married, she took on his children, and subsequently her grandchildren as her own," says Betty Vorenberg, a family friend who has known Marshall for the past 25 years. "She has provided a wonderful family."

Despite her busy schedule, Ms. Vorenberg says, Marshall cares for family and friends with a compassion and grace that defines both her professional and personal life. "It is a very moving thing," she says.

She is a voracious reader, which also stems in part from her early years in South Africa, where certain books where banned. At any given time, she once told the Monitor, she keeps 10 to 15 books by her bed. On vacation, she often reads a book a day.

Marshall's career hasn't been without its controversy. When she was appointed chief justice to the state supreme court in 1999, Cardinal Bernard Law accused her of harboring an anti-Catholic bias.

Others said she didn't have enough trial experience. While she is not expected to become a national lightning rod, her recent decision is likely to catapult her onto the national stage, putting her both in the spotlight and the limelight.

Analysts say the case will undoubtedly be cited as other courts decide on gay marriage, and as couples who are married in Massachusetts attempt to claim marital benefits in other states. "This is going to put her in the forefront of some cutting edge issues in the eyes of many who don't know her," says Joan Lukey, a senior partner with Hale and Dorr in Boston and a longtime colleague.

Already Massachusetts Gov. Mitt Romney (R) has endorsed an amendment banning gay marriage in the state constitution, an issue that will come under focus in the next six months as the legislature grapples with how to comply with the ruling.

Critics nationwide have accused the Massachusetts high court of acting as a legislative arm in forcing the redefinition of marriage. Even supporters have said that it could cause a state constitutional crisis between the court and legislature, or hand the GOP an issue in the 2004 election.

"The Massachusetts decision was very irresponsible," says Gary Bauer, the president of American Values, a public policy group. "And quite frankly the four judges are trying to remake an institution that predates the state of Massachusetts, that predates the US, and has been central to western civilization for 3,000 years."

Supporters say that Marshall is poised to survive the maelstrom, however. "She is a very thoughtful, strong person who comes to conclusions slowly and systematically ... with the weight of conviction and the weight of the law behind them," says Dr. Rudenstine. "I think she will hold up very well."

That is not to say the case hasn't posed a major challenge to her, or the other justices on the court. During a brunch last Sunday at Marshall's house - two days before the ruling - Vorenberg was teasing her. "We never discussed the case beforehand ... But she's been so busy taking care of everything," Vorenberg says. "I told her to hurry up and issue an opinion."

• Stacy A. Teicher contributed to this article from Boston.

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