Sentinel was established in 2003 as a dedicated conservative imprint within Penguin Group. It publishes a wide variety of right-of-center books on subjects like politics, history, public policy, culture, religion, and international relations. The name Sentinel symbolizes a tough-minded defense of America’s fundamental values and national interests.

Some of Sentinel’s most noteworthy bestsellers include Do the Right Thing and A Simple Christmas by Mike Huckabee; A Patriot’s History of the United States by Larry Schweikart and Michael Allen; An American Son by Senator Marco Rubio; Unintimidated by Governor Scott Walker of Wisconsin; The Secret Knowledge by David Mamet; Keeping the Republic by Governor Mitch Daniels of Indiana; Roger Ailes: Off Camera by Zev Chafets; The Tyranny of Clichés by Jonah Goldberg; and George Washington’s Secret Six by Brian Kilmeade and Don Yaeger – a runaway New York Times bestseller for more than three months.

Meet Sentinel

Adrian Zackheim

Adrian Zackheim

Founder, President, and Publisher

Adrian Zackheim joined Penguin Group in September 2001 as Publisher of Portfolio. He then took on the additional challenges of starting Sentinel in April 2003 and Current in March 2010. Previously, he was the Associate Publisher and Editor-in-Chief of HarperInformation, a division of HarperCollins that included HarperBusiness. His editorial career has also included positions at William Morrow, Doubleday, and St. Martin’s Press, and his first job was as Phyllis Grann’s editorial assistant at Putnam.

Among the many bestselling books he edited and published before joining Penguin Group were Good to Great by Jim Collins; Die Broke by Stephen Pollan and Mark Levine; The Dilbert Principle by Scott Adams; The HP Way by David Packard; and Swim with the Sharks without being Eaten Alive by Harvey Mackay. He also has a long track record of publishing books by important conservative leaders, including Margaret Thatcher, Newt Gingrich, and Bob Dole.

Will Weisser

Will Weisser

Vice President, Associate Publisher, and Marketing Director

Will Weisser joined Portfolio as Marketing Director in 2002, before the imprint’s first book was published. In his current role as VP, Associate Publisher, and Marketing Director for Portfolio, Sentinel, and Current, he is deeply involved in all aspects of the publication process, from acquisition to packaging to budgeting. He also oversees the combined marketing and publicity department that serves all three imprints. He began his career as an intern at Simon & Schuster, and went on to various publicity and marketing positions at Pocket Books, Grove/Atlantic, Times Books, and Crown Business. Among the many prominent authors he worked with before joining Penguin Group were Larry Bossidy, Michael Hammer, Marlin Fitzwater, Juan Enriquez, and P.J. O’Rourke.

Eric Nelson

Executive Editor

Prior to arriving at Portfolio and Sentinel in 2014, Eric Nelson was an agent with Susan Rabiner Literary, where he represented Bruce Schneier’s New York Times bestseller Data and Goliath and Nicholas Carlson’s Marissa Mayer and the Fight to Save Yahoo.  He also blogged about book publishing for the literary magazine Ploughshares. Now his Portfolio and Sentinel projects include works by Brent Adamson, Matt Dixon, Dana Loesch, David Mamet, Simon Sinek, Zeynep Tufekci, and Michael Wolff. He also worked for ten years at John Wiley and Sons selling more books about baseball stats and the philosophies behind TV shows that anyone thought possible. He began his career as an intern at Viking publicity, and is happy to be back in 375 Hudson Street after all those years.

Niki Papadopoulos

Niki Papadopoulos

Senior Editor

Niki Papadopoulos joined Portfolio, Sentinel, and Current in 2011 as a Senior Editor. She edits a wide range of idea-driven nonfiction, narrative, biography, memoir, investigative journalism, and prescriptive books for readers of business, science, economics, and conservative politics. Her list of bestselling and critically acclaimed books includes The Index Card by Helaine Olen and Harold Pollack; The Death of Money by James Rickards; The Obstacle Is the Way by Ryan Holiday; Hooked by Nir Eyal; Hatching Twitter by Nick Bilton; Present Shock by Douglas Rushkoff; America in Retreat by Bret Stephens; and An American Son by Senator Marco Rubio.

Stephanie Frerich

Senior Editor

Stephanie Frerich joined Portfolio, Sentinel, Current in 2015 as a Senior Editor, returning to publishing after working at the online education startup Skillshare. Her Portfolio authors include Harvard Business School professor and consultant John Kotter’s 1+ million bestseller Our Iceberg is Melting, along with his newest book That’s Not How We Do It Here; Ivanka Trump’s forthcoming book Women Who Work; Kleiner Perkins partner John Doerr’s forthcoming book Measure What Matters Most; bestselling author and founder of the largest design firm in Silicon Valley Nancy Duarte’s Illuminate: Ignite Change with Stories, Ceremonies, and Symbols; and ZICO founder Mark Rampolla’s High-Hanging Fruit; and. At Skillshare, she helped the startup expand out of design, launching new verticals in entrepreneurship (Guy Kawasaki and Simon Sinek), culinary (butcher Pat LaFrieda and Brooklyn Brewery’s Garrett Oliver), writing (New Yorker’s Susan Orlean and MacArthur Fellow Yiyun Li), and photography (National Geographic’s Ami Vitale and Patagonia’s Jeff Johnson).

Natalie Horbachevsky


Natalie Horbachevsky joined Portfolio, Sentinel, and Current in 2011 and is now an editor with the imprints. She primarily edits business books on a wide variety of topics, including marketing, sales, entrepreneurship, management, leadership, workplace culture, productivity, and technology. Her notable books include New York Times bestsellers Earn the Right to Win by New York Giants head coach Tom Coughlin and The Wisdom of Oz by Roger Connors and Tom Smith; 800-CEO-READ Management Book of the Year Joy, Inc. by Richard Sheridan; Finish Big by Bo Burlingham, I Know How She Does It by Laura Vanderkam, Dealstorming by Tim Sanders, Superbosses by Sydney Finkelstein, and Hug Your Haters by Jay Baer.

Follow her on Twitter @nathorbachevsky


Jesse Maeshiro

Associate Editor

Jesse Maeshiro joined Portfolio, Sentinel, Current in 2013. She enjoys working on business and science titles in the areas of narrative nonfiction, investigative journalism, career development, entrepreneurship, leadership, workplace culture, productivity, creativity, and technology.  Her current list includes notable books such as: Blockchain Revolution by Don and Alex Tapscott, O Great One! by David Novak, The Go-Giver Leader by Bob Burg and John David Mann, and Indentured by Joe Nocera and Ben Strauss.

Bria Sandford


Bria Sandford joined Portfolio, Sentinel, and Current in 2012. She primarily edits conservative political books but also enjoys working on leadership narratives and prescriptive career guides. Her notable books include New York Times bestsellers Thomas Jefferson and the Tripoli Pirates by Brian Kilmeade and Don Yaeger, A More Perfect Union by Ben Carson, and Team of Teams by General Stanley McChrystal, as well Jack Kemp by Morton Kondracke and Fred Barnes, and Our Lost Constitution by Senator Mike Lee.

Sentinel Newsroom

May 6, 2015

On Monday, Carly Fiorina launched Rising to the Challenge, her second book with Sentinel, and a sequel to her 2006 New York Times bestseller Tough Choices, which came BEFORE Hard Choices – as Seth Meyers pointed out on Late Night on Tuesday.  Fiorina announced her candidacy for the Republican presidential nomination on Good Morning America and went […]

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April 7, 2015

Sentinel had a big week with the launch of Our Lost Constitution by Senator Mike Lee (R-Utah). He hit the airwaves for Hannity, Mark Levin and Glenn Beck Radio to promote the book, which went on sale Tuesday (4/7) and hit #13 on and He appeared on Morning Joe, Fox & Friends,and will be […]

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June 12, 2014

Last Friday The Los Angeles Times ran a glowing review of Steven Pressfield’s The Lion’s Gate: On the Front Lines of the Six Day War, calling the book “[a] deeply reported and compellingly told ‘hybrid history’ of the 1967 Arab-Israeli war.”  

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