A private-equity firm that focuses on investments in education companies has acquired Schiller International University, a family-owned college of about 1,200 students that is based in Florida and has campuses in six countries.

The deal, announced today, is another sign of private-equity investors’ continuing interest in higher-education investments with an international flavor.

The buyer is the private-equity arm of Knowledge Investment Partners, based in Cleveland. Robert Daugherty, the firm’s founder and managing partner, said the university would become a “flagship investment in higher education” for the firm. He declined to disclose the purchase price, or other details about the transaction.

Schiller’s main programs are in business, international relations and diplomacy, international hotel and tourism management, and information-technology management.

In a message to Schiller’s students and employees on its Web site, Mr. Daugherty said that his firm planned to “significantly increase enrollments at all of Schiller’s existing campuses,” and that it expected to add two or three new campuses, possibly in Asia, the Middle East, or South America.

Schiller, which was founded in 1964 by the Walter Leibrecht, already has campuses in London, Madrid, and Paris as well as Heidelburg, Germany; Leysin, Switzerland; and Strasbourg, France. —Goldie Blumenstyk