John Oller

John Oller is an American biographer, historian, and former Wall Street attorney.

Career After graduating from law school, Oller became a litigation associate and later a partner at white-shoe law firm Willkie Farr & Gallagher in New York City, where he represented Major League Baseball, including in the George Brett Pine Tar Incident as well as the Pete Rose sports betting case, as described in the Dowd Report. As a partner of the firm, he went on to specialize in complex commercial and securities litigation, and was a principal author of the Audit Committee Report for Cendant Corporation (at the time, the most massive fraud in American corporate history). The New York Times called the report a definitive case study in the area of accounting irregularities and fraud. In 2004, he authored a history of the Willkie firm. Oller retired from legal practice in 2011 to focus on writing.

One Firm – A Short History of Willkie Farr & Gallagher, 1888 – (2004) One Firm – A Short History of Willkie Farr & Gallagher, 1888 – is a history of the firm at which Oller was a law partner. Oller, a student at Ohio State University in Columbus when the murder occurred, began investigating the case in 2013.

The Swamp Fox (2016) The Swamp Fox: How Francis Marion Saved the American Revolution is a biography of American guerrilla warrior Francis Marion.

White Shoe (2019) White Shoe: How a New Breed of Wall Street Lawyers Changed Big Business and the American Century is a history of the American white-shoe firm.

Gangster Hunters (2024) Gangster Hunters: How Hoover's G-Men Vanquished America's Deadliest Public Enemies is the story of the early FBI agents who brought down John Dillinger, Bonnie & Clyde and other 1930s criminals.

Personal life A golfer, Oller won Willkie Farr & Gallagher's annual golf tournament in Florida four times (a record).