"Theatre Talk" airs Friday nights in New York City. Its many guests include stage actors, directors and playwrights, as well as theatre critics. According to show producer and co-host Susan Haskins, Mr. Dieter—along with his wife and creative partner, Kay Hines—was instrumental in the development of the show. "Without his tireless (and cheap) work on the project, the show never could have gotten off the ground," said Haskins. "He dedicated himself to many theatrical projects this way."

Mr. Froese was born in 1937 in East Prussia. After winning a Ford Foundation grant, he moved to the United States in 1964. His work in painting, drawing, photography, sculpture, performance and film was exhibited at P.S. 1, the Whitney Museum and MoMA, according to the Times. In 1979, he and Hines founded Dekart Video, which produced work for PBS, museums and other institutions.

A memorial for Mr. Froese will be held at Millenium (55 E. 4th Street) at 7 PM July 6.