Ronald F. Pollack has been apppointed dean of the Antioch School of Law here, ending that school's search for a replacement for codeans Edgar and Jean Cahn.

The Cahns were fired last January after a dispute over the financial autonomy of the law school, a division of Antioch University of Yellow Springs, Ohio.

The school has been headed for the last several months by acting dean Joseph Meng, who has been named executive consultant to the president of Boston University.

Since August 1978, Pollack has been a research fellow for the Research Institute of the Legal Services Corp. where he analyzed and provided legal assistance on employment programs.

He founded the Food Research and Action Center in 1970 to provide legal assistance on government welfare programs to the poor, and was its director through 1978. He has taught at several law schools, and was chairman of a 26-member panel organized by the U.S. Senate to make recommendations on the nation's food policies.

Pollack's appointment was announced by Antioch University President William M. Birenbaum.

Antioch, which specializes in clinical legal education, this spring won reaccreditation from the American Bar Association. Antioch has been the focus of several controversies this year, including a still unresolved attempt by the Legal Services Corp. to take away a major grant from the university.