"I am not a welfare queen," says Melissa Bruninga-Matteau.

That's how she feels compelled to start a conversation about how she, a white woman with a Ph.D. in medieval history and an adjunct professor, came to rely on food stamps and Medicaid. Ms. Bruninga-Matteau, a 43-year-old single mother who teaches two humanities courses at Yavapai College, in Prescott, Ariz., says the stereotype of the people receiving such aid does not reflect reality. Recipients include growing numbers of people like her, the highly educated, whose advanced degrees have not insulated them from financial hardship.

"I find it horrifying that someone who stands in front of college classes and teaches is on welfare," she says....

A record number of people are depending on federally financed food assistance. Food-stamp use increased from an average monthly caseload of 17 million in 2000 to 44 million people in 2011, according to the U.S. Department of Agriculture's Web site. Last year, one in six people—almost 50 million Americans, or 15 percent of the population—received food stamps.

Ms. Bruninga-Matteau is part of an often overlooked, and growing, subgroup of Ph.D. recipients, adjunct professors, and other Americans with advanced degrees who have had to apply for food stamps or some other form of government aid since late 2007.

Some are struggling to pay back student loans and cover basic living expenses as they submit scores of applications for a limited pool of full-time academic positions. Others are trying to raise families or pay for their children's college expenses on the low and fluctuating pay they receive as professors off the tenure track, a group that now makes up 70 percent of faculties. Many bounce on and off unemployment or welfare during semester breaks. And some adjuncts have found themselves trying to make ends meet by waiting tables or bagging groceries alongside their students.

Of the 22 million Americans with master's degrees or higher in 2010, about 360,000 were receiving some kind of public assistance, according to the latest Current Population Survey released by the U.S. Census Bureau in March 2011. In 2010, a total of 44 million people nationally received food stamps or some other form of public aid, according to the U.S. Department of Agriculture.

People who don't finish college are more likely to receive food stamps than are those who go to graduate school. The rolls of people on public assistance are dominated by people with less education. Nevertheless, the percentage of graduate-degree holders who receive food stamps or some other aid more than doubled between 2007 and 2010.

During that three-year period, the number of people with master's degrees who received food stamps and other aid climbed from 101,682 to 293,029, and the number of people with Ph.D.'s who received assistance rose from 9,776 to 33,655, according to tabulations of microdata done by Austin Nichols, a senior researcher with the Urban Institute. He drew on figures from the 2008 and 2011 Current Population Surveys done by the U.S. Census Bureau and the U.S. Bureau of Labor....