He grew up in Washington, DC, then served as a U.S. Marine in the Pacific theater during World War II and fought in the invasions of New Britain, Guam and Peleliu. He also served in Korea during the Korean War.
After the war, he was a reporter for The Washington Evening Star, focusing on defense and foreign policy issues. When the Star folded in 1981, O'Leary joined the Reagan Administration as press secretary for National Security Advisor William P. Clark, Jr. Soon after the founding of The Washington Times in 1982, he joined that paper as a White House correspondent, became president of the White House Correspondents Association , and ended his career writing a weekly column focused on nostalgic reminiscences of the past.
- Maria O'Leary: "Remembrances: O’Leary," in The Washington Times, http://www.washingtontimes.com/news/2008/nov/11/a-typewriter-and-a-weapon/print/, Tuesday, November 11, 2008; cum semper fidelis.
- Obits - Washington Star Alumni: Jeremiah O'Leary - An American newspaper reporter and columnist - 1993, http://washingtonstarobits.blogspot.com/2010/05/jeremiah-oleary-american-newspaper.html, accessed 14 Dec 2011.
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