In the 1960s, Betty Jensen Hall’s new marketing strategy increased profits markedly and the firm expanded, producing other library references in the sciences, humanities, fine arts, and music.

Beginning in 1971, two years after being acquired by ITT, the firm became a leading pioneer of publishing large-print editions of best-selling fiction and non-fiction books.

In 1972 it acquired Gregg Press the scholarly reprint company.

In 1990 it acquired Thorndike Press, its main American large print competitor.

In 1990, Macmillan was acquired by Robert Maxwell, and in 1991 its order processing and shipping functions were moved to Riverside, N.J., its editorial and marketing functions distributed to other divisions, and its Boston office was closed.