Kroll is an American corporate investigation and risk consulting firm established in 1972 and based in New York City. In 2018, Kroll was acquired by Duff & Phelps. In 2021, Duff & Phelps decided to rebrand itself as Kroll, a process it completed in 2022. History Kroll was founded in 1972 by Jules Kroll as a consultancy servicing corporate purchasing departments. Kroll began its line of work in financial sector investigations in the 1980s when corporations approached Kroll to profile investors, suitors, and takeover targets. In the 1990s, Kroll expanded into forensic accounting, background screening, drug testing, electronic data recovery, and market intelligence. In 1997, Kroll merged with vehicle armoring company O'Gara-Hess & Eisenhardt to form Kroll-O'Gara. The company became public and was listed on the NASDAQ as "KROG". In August 2001, the O’Gara vehicle armoring businesses were sold to Armor Holdings, and the company's name was changed to Kroll Inc. and its ticker symbol to "KROL". In 2002, Kroll acquired restructuring firm Zolfo Cooper for $153 million. At the time, Zolfo Cooper was working on the Enron case. In July 2004, Kroll was acquired by professional services firm Marsh & McLennan Companies in a $1.9-billion transaction. In June 2008, Jules Kroll left Kroll Inc. In August 2010, Kroll was acquired by Altegrity, Inc. in an all-cash transaction valued at $1.13 billion. Altegrity declared bankruptcy in 2015, and Kroll was later bought by Corporate Risk Holdings, LLC. On October 21, 2016, Carlyle Group-owned LDiscovery purchased Kroll Ontrack for around $410 million and operated it as a separate company. In 2018, Kroll acquired cybersecurity firm Tiversa. On June 4, 2018, Duff & Phelps purchased Kroll Inc. In February 2021, Duff & Phelps announced plans to unify the companies under the Kroll brand, which completed in February 2022. On March 25, 2021, Kroll announced that it had acquired Redscan, a UK based cyber security company. In March 2022, Kroll acquired Canadian risk intelligence software company Resolver. Services Background screening Kroll's background screening division provides screening services for areas such as employment, supplier selection, investment placement and institutional admissions. Kroll's Background Screening division also includes the Kroll Fraud Solutions unit, which specializes in identity theft protection and identity restoration services. Security consulting Kroll offers consulting services through Kroll Security Group, its Security Consulting and Security Engineering & Design division. In 2020, Kroll was hired by the Austin Police Department to evaluate the department's