In 1972–1973 his exhibitions are mounted at the Kunsthalle Bern and the Museum of Modern Art, Oxford.
1975
Two MATRIX exhibitions at the Wadsworth Atheneum
For the third MATRIX exhibition at the Wadsworth Atheneum in Hartford he creates “The Location of a Rectangle for the Hartford Atheneum”; later that year he takes part in the sixth MATRIX, providing instructions for a second wall drawing.
1976
Co-founds Printed Matter
With fellow artists and critics — Lucy Lippard, Pat Steir, Ingrid Sischy and others — he helps found Printed Matter, a non-profit art space in New York's Tribeca and one of the first organizations dedicated to creating and distributing artists' books.
