In 1967 Ramsden moved to New York City in the United States and began the series of the Secret Paintings and the Two Black Squares.
As a member of Art & Language in 1972, Ramsden participated in Documenta 5 in Kassel, Germany with the project "Index 0001" in the department Idea + Idea/Light, together with the Art & Language artists Terry Atkinson, David Bainbridge, Ian Burn, Charles Harrison, Harold Hurrell, Michael Baldwin and Joseph Kosuth.
From 1977, Baldwin and Ramsden continued Art & Language as a project.
During this time, an extensive body of work of objects and images was created.
Many texts were written with Charles Harrison and Michael Baldwin, who published "Art-Language" from 1971.