Kroll (formerly Duff & Phelps) is a financial and risk advisory firm established in 1932 and based in New York City.

As part of the transaction, the company was merged with Stone Ridge Partners, a middle-market investment banking firm.

[citation needed] In 2007, Duff & Phelps completed its second initial public offering raising $133 million and listing the company's shares on the New York Stock Exchange.

The firm has continued its acquisition strategy acquiring Dubinsky & Co., a financial consulting company and Kane Reece Associates.

[16] In 2010, the firm acquired the consulting business of Dynamic Credit Partners, bringing specialized talent in complex fixed income securities analysis, valuation and litigation support.

[20] The management team, led by CEO, Noah Gottdiener and President, Jacob Silverman, maintained a significant equity stake in the company and remained in their rolls.

[23] In June 2010, Duff & Phelps announced it acquired Cole & Partners, a Toronto-based independent financial advisory practice.

The acquisition established a Canadian presence for Duff & Phelps and enhanced the firm’s dispute consulting, valuation and corporate finance advisory services.

[24] In July 2011, Duff & Phelps announced it acquired Growth Capital Partners, a Texas-based investment banking firm focused on transactions in the middle market.

The acquisition expanded Duff & Phelps’ Global Restructuring Advisory Practice to include more than 200 professionals across Europe, the U.S. and Canada.

This acquisition broadened the type of valuation work Duff & Phelps did in the U.S., specifically in fixed asset management and insurance solutions (FAMIS).

[47] In August 2020, in the Court of Session, the Scottish Lord Advocate accepted that the prosecution of two Duff & Phelps administrators, Paul Clark and David Whitehouse, after the Rangers F.C.

[54] Kroll's business and investigations practice provides background checks on Instagram influencers, using publicly-accessible online information to prevent them being 'cancelled' for problematic or potentially disreputable behaviour (e.g. tweets which includes offensive language or content).

"[60] Two weeks into the trial Kroll produced Faraculah Arras, who was prepared to testify he was involved in one of Karaduman's drug deals.

Abrams used Kroll again in 1998 to investigate claims by CNN's Newsstand documentary that sarin nerve gas had been used in Vietnam in 1970 as part of Operation Tailwind.

[citation needed] Fernando Henrique Cardoso, Daniel Dantas, the company in question, André Esteves, Roberto Mangabeira Unger and Dario Messer signed a schedule agreement to privatize Brazilian state-owned enterprises.

[65] Just prior to the September 11 attacks, Kroll Inc., under the guidance of Jerome Hauer, the managing director of their Crisis and Consulting Management Group,[45] hired former FBI special investigator John P. O'Neill,[66] who specialized in the Al-Qaeda network held responsible for the 1993 bombing, to head the security at the WTC complex.

[68][69] On March 15, 1992, following accusations from First Deputy Prime Minister Yegor Timurovich Gaidar of "large-scale privatization by the nomenklatura", the Russian government froze all capital outflows from Russia, and eventually, the assets of the Vnesheconombank.

[69][70] Despite investigators stating they received very little support from Russian authorities, Kroll determined more than $14 billion (in 1991 real dollars) had been transferred from Switzerland to New York prior to the putsch (mostly in joint-stock companies, such as the Leningrad Association of Joint Ventures),[70][71] and that another $40 billion plus (in 2014 dollars) had been transferred out of Russia by the Communist Party and other government agencies of the former Soviet Union, through hundreds of illicit transactions.

[73] In 2015 Kroll was hired by Harvey Weinstein to wipe evidence of sexual abuse from the electronic devices of Ambra Gutierrez as part of a settlement he reached with her.