Marian Goodman, a renowned New York art dealer who favored artwork that was difficult, abstruse and sometimes unsalable, and who played a key role in bringing avant-garde European art to prominence in the 1980s, died on Thursday in Los Angeles. She was 97. Linda Pellegrini, a spokesman for Ms. Goodman’s gallery, confirmed the death, in a hospital. Ms. Goodman had moved to Los Angeles to be near her son. In 1977, when Ms. Goodman opened the gallery on 57th Street that bears her name, American art dominated the market, and the capitals of Europe had yet to recapture the cultural...