Minimalist musician whose best-known functions included “Rock Field Sculpture” from 1977 and “144 Lead Square” from 1969. His “Lever” was controversial and highlighted prominently on the 1966 Principal Structures present at New York’s Jewish Museum. He graduated in the Phillips Academy in Andover, Massachusetts, in 1953 and afterwards served within the U.S. Military. He and Hollis Frampton became friends at Phillips. He helped organize the Artwork Employees Coalition in 1969. He was accused of murder when his wife Ana Mendieta dropped from his house window following a warmed argument. The situation against him lacked proof, and he was ultimately acquitted. He and fellow American musician Tony Smith both created minimalist sculptures.