Other former students wrote that he linked the study of math with "literature, music, politics and Americana" and showed "how solutions to [math problems] were often found in disparate corners of the globe," observed another.

Another student recalled the major lesson that Dr. Rosenzweig impressed upon them, especially those who planned careers in education: "Be over-prepared, care about your students, care about your subject matter, and care about how your students learn the subject matter."

From 1977 to 1978, Dr. Rosenzweig was a visiting scholar at the University of California at Berkeley, and beginning in the 1990s taught summers at Cornell University in Ithaca, N.Y. He also had been the recipient of several National Science Foundation Fellowships through the years.

He was an avid tennis player.

"Harry was a good, competitive tennis player," said Dr. Williams. "He had won several Carroll County Tennis Association tournaments in the 35-and-over group."

He also enjoyed hiking, said his wife, the former Frances Richards, whom he married this year.

He was an aficionado of the Victorian period and collected R.S. Prussia porcelain, which was produced by Reinhold Schlegelmilch from the late 1800s to World War I in Suhl, Germany. Other collecting interests included elegant Victorian hatpins.

Services will be held at noon Wednesday at Sol Levinson & Bros., 8900 Reisterstown Road, Pikesville.

In addition to his wife, Dr. Rosenzweig is survived by a son, Scott Rosenzweig of Bozeman, Mont.; two daughters, Janis Davisson of Crofton and Laura Reames of Towson; a sister, Helen Santis of Concord, Mass.; and six grandchildren. An earlier marriage to the former Susan Shanken ended in divorce.

fred.rasmussen@baltsun.com

An earlier version of this obituary misstated the years that Mr. Rosenzweig was chairman of the McDaniel College math and computer science department. The Baltimore Sun regrets the error.