April 5, 1991 — Twenty-first Century Books was acquired by Henry Holt & Company.

About Twenty-first Century Press

Twenty-First Century Books (TFCB) is a wide-ranging imprint committed to producing relevant high-interest and curriculum-related nonfiction content across disciplines, eras, and cultures for an upper-grade readership.

About Henry Holt and Company, Inc.

Henry Holt is one of the oldest publishers in the United States.