Sewall was later education editor at Newsweek magazine where he won national prizes for articles on testing and textbooks.
Sewall is a former member of the Publishing Research Quarterly and Phi Delta Kappan editorial boards.
In the wake of Donald Trump's 2016 election as President of the United States, Sewall argued that the left, contrary to evidence, has launched "a concerted semantic campaign" to smear him by associating him with white supremacists.
[5] Sewall is the author of Necessary Lessons: Decline and Renewal in American Schools (Free Press, 1983) and the co-author of After Hiroshima: The USA since 1945 (Longman, 3rd edition, 1992).
His articles have appeared in the New York Times, Wall Street Journal[6], Fortune, American Educator, and many other publications.