Famed American artist and sculptor Richard Serra, known for turning curving walls of rusting steel and other malleable materials into large-scale pieces of outdoor artwork that are now dotted across the world, died Tuesday at his home in Long Island, New York. He was 85.

Considered one of his generation’s most preeminent sculptors, the San Francisco native originally studied painting at Yale University but turned to sculpting in the 1960s, inspired by trips to Europe.

His death was confirmed Tuesday night by his lawyer, John Silberman, whose firm is based in New York. He said the cause of death was pneumonia.

Known by his colleagues as the “poet of iron,” Serra became world-renowned for his large-scale steel structures, such as monumental arcs, spirals, and ellipses. He was closely identified with the minimalist movement of the 1970s.

Serra’s work started to gain public attention in 1981, when he installed a 120-foot-long (36.5-meter-long) and 12-foot-high (3.6-meter-high) curving wall of raw steel that splits the Federal Plaza in New York City. The sculpture, called Tilted Arc, generated swift backlash from people who work there and a fierce demand that it should be removed. The sculpture was later taken down, but Serra’s popularity in the New York art scene had been cemented.

Most of Serra’s large-scale works are welded in Cor-Ten steel, but he also worked with other nontraditional materials such as rubber, latex, neon—as well as molten lead, which Serra threw against a wall or floor to create his “Splash” series in his early career.

His works have been installed in landscapes and included in the collections of museums across the world, from The Museum of Modern Art in New York to the deserts of Qatar.

In 2005, eight major works by Serra were installed permanently at the Guggenheim Museum in Spain. Carmen Jimenez, the exhibition organizer, said Serra was “beyond doubt, the most important living sculptor.”

Born to a Russian-Jewish mother and a Spanish father in San Francisco, Serra was the second of three sons in the family. He started drawing at a young age and was inspired by the time he spent at a shipyard where his father worked as a pipe fitter. Before his turn to sculpting, Serra worked in steel foundries to help finance his education at the Berkeley and Santa Barbara campuses of the University of California. He then went on to Yale, where he graduated in 1964.

—Susan Haigh and Trân Nguy?n, Associated Press