Early on, he worked in the first three modes but in 1969, while on sabbatical in Florence, Italy as a Fellow at Villa I Tatti, the Harvard Center for Renaissance Studies, he began to compose collages of weathered paper and continued this for a decade.
[4][5] In the late 1970s, while continuing collage making, Kremen returned to three-dimensional work, now in iron and scrap steel, and by the later '90s entered a collaboration with the sculptor William Noland.
Whereupon, in 1946, he left Chicago for the renowned Black Mountain College, an experimental educational community founded in 1933 near Asheville, N.C.[8] There Kremen spent his time focussed on writing and the literature classes given by the poet M. C. Richards.
Beginning in 1947 and for the next eight years he lived in Greenwich Village, writing, reading widely, working variously in bookstores and in publishing, and broadening his knowledge of art and its history.
With his wife Barbara Kremen and their two children he left Cambridge for a professorial position on the faculty of the Psychology Department at Michigan State University.