Ron Kessler...has enjoyed a reputation for solid reporting over the past four decades. Lloyd Grove, The Daily Beast

Kessler's such a skilled storyteller, you almost forget this is dead-serious nonfiction... Newsweek
 
[Ronald Kessler] is the man who broke the story about the [Secret Service prostitution] episode in Cartagena.... New York Times
 
His [Kessler's] book quotes both flattering and unflattering observations about presidents of both parties. FactCheck.org

[Kessler has] done groundbreaking work over the years, [resulting in] major scoops. Michael Isikoff, Chief Investigative Correspondent, Yahoo! News

A Justice Department official...noted that the original charges against [FBI Director William] Sessions came not from FBI agents but from a journalist, Ronald Kessler [who uncovered the abuses while writing a book about the FBI, leading to Sessions' dismissal]. Washington Post

[Ronald Kessler] is one of the nation's top investigative journalists. Fox & Friends 

Along with the memoirs of Katharine Graham and Ben Bradlee, Bob Woodward lists Ronald Kessler's book The CIA at War under Fact Sheet on his website BobWoodward.com as one of five books he recommends to learn more about himelf.

Ron Kessler appears to get everything first. Slate