During her years as an attorney for one of the top international law firms in the United States, Angela Williams looked forward to defending clients. But sometimes she was not given the chance.

"When it came time for an opportunity to represent Fortune 500 companies on huge cases, even though I might have had trial experience over and above my white male colleagues, they were chosen," says Ms. Williams, who is African-American.

In an age of diversity, when many companies point with pride to their multicultural workforce, a sobering reality remains: Minority professionals often find their career ambitions thwarted by hidden bias - what workplace experts call the new face of discrimination. "Acting white," they say, can be the price of promotion in a business world where white men account for 98 percent of CEOs and 95 percent of top earners in Fortune 500 companies. Diversity does not always extend to the executive suite.

"Minorities are getting stuck in the early stretches of career structures," says economist Sylvia Ann Hewlett, whose study of minority professionals appears in the November Harvard Business Review. "They are not getting promoted and advanced at a rate commensurate with their weight in the talent pool."

In a survey of more than 1,600 minority professionals, Dr. Hewlett and Princeton professor Cornel West found that sterling credentials can be overshadowed by personal and cultural traits. Everything from cornrows, ethnic jewelry, animated hand gestures, and certain manicures can leave colleagues thinking, "You're different."

Forty years ago, it was very easy to see prejudice, Hewlett notes. "People wore it on their sleeve and enshrined it in law. Today, it's much more subtle, but it's pervasive. Whether it's a tone of voice or hairstyle or accent, the cumulative impact can be brutal and can derail a career."

The study comes just weeks after Neil French, the creative director of WPP Group, reportedly explained the small ranks of female advertising directors by saying that "they don't deserve to make it to the top" because of their family obligations. He resigned over the flap.

While the proverbial glass ceiling remains one obstacle for women and minorities, Hewlett identifies another barrier - a "Jell-O floor" that keeps them mired in negative stereotypes.

Over 40 percent of minority professional women in large corporations say they feel excluded and constrained by "style compliance" - the need to blend into a corporate culture dominated by white men. More than a third of minority men feel the same way.

"The pressure is added for minority professionals because we don't necessarily come from the same background as those in leadership positions, and we haven't had the same experiences," says Williams, a vice president of Sears in Chicago.

A quarter of minority businesswomen worry that they are perceived as "affirmative action" hires. In addition, nearly a third of minority female executives are concerned that their speaking style labels them as lacking leadership potential.

"Asian women executives were convinced that they weren't commanding enough in their tone of voice, and were not assertive," says Hewlett. "African-American managers were quite sure they spoke too loudly, were too threatening."

One woman, a native of India who works as an IT executive at a Fortune 500 company, learned that colleagues regarded her as quiet. "There are people who talk just to be talking," says the woman, who asks not to be identified to protect her job. "That's not my style. People said, 'She's quiet.' Management perceived that I didn't have leadership quality. Eventually people said, 'But when she says something, it's valuable.' The last few years, I haven't heard them talk about this 'quiet' thing."

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