Born in East Orange, N.J., and raised in Baltimore, he graduated from City College's night school.
He received a bachelor's degree in political science at the University of Maryland, College Park, where he also earned a master's. He received a doctoral degree in government and public administration from American University in Washington.
Mr. Harrison had also been a reporter for The Baltimore Sun and the old Baltimore News-Post nearly 60 years ago.
At his death, he was teaching at the University of Miami's School of Communication. Previously, he taught part time at American University and at the Pentagon.
Since 1999, Mr. Harrison had edited Menckeniana, a quarterly journal about the life and literary work of Mencken, published by the Enoch Pratt Free Library.
He was the author of the "Editorial Art of Edmund Duffy," a 1998 work about the Baltimore Sun cartoonist who won three Pulitzer Prizes.
Mr. Harrison was communications director for the Corporation for Public Broadcasting from 1976 to 1985. He had earlier edited a mass transit trade magazine, served as an associate editor of the National Journal and was a senior analyst at the Defense Department. In the 1950s, he worked in customer relations at the Martin Co. in Middle River.
Services are private.
Survivors include his wife of 55 years, the former Frances Keane of Woodbine; two brothers, Larry Harrison of St. Petersburg, Fla., and Carroll Harrison of Bel Air; and a sister, Linda Harrison of Keswick, Va.