Early career 
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Adelman began working for the government in 1969 at the Commerce Department, and then served in the Office of Economic Opportunity. From 1975 to 1977 during the Gerald Ford administration, Adelman was an Assistant to United States Secretary of Defense Donald Rumsfeld, and was later a member of the Defense Policy Board. He has also served as a national editor of Washingtonian magazine for more than 17 years.
He was the deputy U.S. Ambassador to the United Nations for two-and a half years, working with Jeane Kirkpatrick. He also served as the Director of the U.S. Arms Control and Disarmament Agency for nearly five years, during the Reagan administration. He was an advisor to President Ronald Reagan during the superpower summits between Reagan and Soviet General Secretary Mikhail Gorbachev.
Later career 
Adelman was a member of the Pentagon's Defense Policy Board well-known[by whom?] for his involvement in conservative policy efforts dating back to the 1970s, when he was a member of the Committee on the Present Danger. He strongly supported the war on Iraq and worked for the think tank Project for the New American Century, arguing for new policies to help the United States remain a global leader. Adelman, called "a lifelong neocon activist", worried in 2006 that the incompetence shown in handling the war in Iraq would damage the neoconservative movement: neoconservatism, he said, "is not going to sell" for at least a generation.
Adelman went on to become senior counsel at Edelman Public Relations, where he led several campaigns linked to U.S. trade and intellectual property interests via the organization USA Innovations, an organization he also leads. Using the USA Innovations platform and through other published articles Adelman has attacked the Government of Thailand for violating U.S. pharmaceutical industry HIV/AIDs drug intellectual property patents and other topics linked to Edelman Public Relations clients.
Adelman is also an expert on William Shakespeare and has taught extension school classes at Georgetown University and George Washington University on Shakespeare. He co-wrote with Norman R. Augustine a book on drawing leadership lessons from Shakespeare, called Shakespeare in Charge: The Bard's Guide to Leading and Succeeding on the Business Stage. He is known for invocations of Shakespeare in favor of his political positions, including an NPR analysis of a scene from Othello in support of the invasion of Iraq, and lauding President Bush as King Henry V.
Promotion of Iraq invasion 
Adelman wrote a pair of editorial columns regarding the Iraq War in the Washington Post in February 2002 and April 2003 entitled, respectively, "Cakewalk In Iraq" and "'Cakewalk' Revisited". In the first he argued that the U.S.-led invasion of Iraq would be a simple matter to accomplish: "I believe that demolishing Hussein's military power and liberating Iraq would be a cakewalk." In the later editorial, published just a few weeks after the invasion, he claimed his vindication and in particular praised key Bush administration players: "My confidence 14 months ago sprang from having worked for Don Rumsfeld three times -- knowing he would fashion a most creative and detailed war plan -- and from knowing Dick Cheney and Paul Wolfowitz well for many years."
Also notable are Adelman's predictions regarding weapons of mass destruction in Iraq. Adelman said that weapons were likely to be near Tikrit and Baghdad, "because they're the most protected places with the best troops. I have no doubt we're going to find big stores of weapons of mass destruction."
Regrets of Iraq stance 
In an article first appearing on the website of Vanity Fair in November 2006, Adelman wrote that he regrets urging military action in Iraq and feels that he overestimated the abilities of the Bush administration leadership. He was quoted as saying "I just presumed that what I considered to be the most competent national security team since Truman was indeed going to be competent." He also added, "They turned out to be among the most incompetent teams in the postwar era. Not only did each of them, individually, have enormous flaws, but together they were deadly, dysfunctional." He wrote that the conduct of the war "just breaks your heart," and it "didn’t have to be managed this bad; it’s awful." In an article in The New Yorker, Adelman said of Rumsfeld, a friend and associate of 36 years: “How could this happen to someone so good, so competent? This war made me doubt the past. Was I wrong all those years, or was he just better back then? The Donald Rumsfeld of today is not the Donald Rumsfeld I knew, but maybe I was wrong about the old Donald Rumsfeld. It’s a terrible way to end a career. It’s hard to remember, but he was once the future.”
Support for Barack Obama 
The New Yorker reported on October 20, 2008, that Kenneth Adelman decided to buck his conservative leanings and vote for Senator Barack Obama for President on November 4, 2008. According to the New Yorker, Adelman made his decision "[p]rimarily for two reasons, those of temperament and of judgment." He explained:
When the economic crisis broke, I found John McCain bouncing all over the place. In those first few crisis days, he was impetuous, inconsistent, and imprudent; ending up just plain weird. Having worked with Ronald Reagan for seven years, and been with him in his critical three summits with Gorbachev, I’ve concluded that that’s no way a president can act under pressure.
Second is judgment. The most important decision John McCain made in his long campaign was deciding on a running mate.
That decision showed appalling lack of judgment. Not only is Sarah Palin not close to being acceptable in high office—I would not have hired her for even a mid-level post in the arms-control agency. But that selection contradicted McCain’s main two, and best two, themes for his campaign—Country First, and experience counts. Neither can he credibly claim, post-Palin pick.
Soon after he authored a Huffington Post article entitled Why a Staunch Conservative Like Me Endorsed Obama where he wrote, "Granted, McCain's views are closer to mine than Obama's. But I've learned over this Bush era to value competence along with ideology. Otherwise, our ideology gets discredited, as it has so disastrously over the past eight years." He added, "McCain's temperament -- leading him to bizarre behavior during the week the economic crisis broke -- and his judgment -- leading him to Wasilla -- depressed me into thinking that "our guy" would be a(nother) lousy conservative president. Been there, done that." 
A Reuters article quotes Adelman as saying I am a Republican and only voted for one Democrat in my entire life, and that was very much an anti-McCain vote. I thought Obama was going to be better than he turned out to be. Reuters also states that he was backing Romney. 
- Peter, Spiegel (2007-01-04). "Old guard back on Iraq policy [page 3]". LA Times. Retrieved 2009-04-08.
- Rose, David (November 3, 2006). "Now They Tell Us". Vanity Fair. Retrieved 2007-10-24.
- Weissman, Robert (2007-05-07). "Ken Adelman's (New) Lies". The Huffington Post.
- Augustine, Norman; Kenneth Adelman (2001-05-16). Shakespeare in Charge: The Bard's Guide to Leading and Succeeding on the Business Stage. ISBN 0-7868-8644-7.
- Adelman, Kenneth (2002-02-13). "Cakewalk in Iraq". The Washington Post.
- Adelman, Kenneth (2003-04-10). "'Cakewalk' Revisited". The Washington Post.
- Allen, Mike; Dana Milbank (2003-03-23). "Question of the Day Dogs Administration Officials". The Washington Post.
- Borger, Julia (2006-11-04). "Neocons turn on Bush for incompetence over Iraq war". The Guardian.
- Knowlton, Brian (2006-11-09). "Kissinger Says Victory in Iraq Is Not Possible". The New York Times.
- Goldberg, Jeffrey (November 10, 2006). "Inner Office - End of the Affair". The New Yorker. Retrieved 2006-12-05.
- Packer, George (October 20, 2008). "First Colin Powell, Now...". The New Yorker (online only).
- Adelman, Kenneth (October 24, 2008). "Why a Staunch Conservative Like Me Endorsed Obama". The Huffington Post. Retrieved 2008-10-26.
- Patricia Zengerle and Eric Johnson (November 1, 2011). "Insight: In 2012, some "Obamacons" turn back to Republicans". Reuters. Retrieved 2012-10-18.
- "Interview with Kenneth Adelman" (pdf). Ronald Reagan Oral History Project. Miller Center of Public Affairs. 2003-09-30.
- Nomination of Kenneth L. Adelman To Be United States Deputy Representative to the United Nations (1981)
- Booknotes interview with Adelman on The Great Universal Embrace, Arms Summitry -- A Skeptic's Account, October 21, 1989.