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Robert Half and his wife Maxine, founded the Robert Half Personnel Agency in New York City in 1948. He also created Accountemps, a company founded to supply temporary accountants.
The firm went public in 1987, then expanded its operations into Europe in 1993. In addition to the Accountemps brand, the firm expanded to include specialty groups focusing on technology, legal and creative services personnel. In 1991, the company acquired The Affiliates, renaming it as Robert Half Legal.
Robert Half also provides independent risk consulting, internal audit and information technology consulting services via its Protiviti subsidiary, founded in 2002 with the acquisition of former employees of Arthur Andersen.
In 2003, the company bought back the last of the few remaining independent franchise operations.
In 2006, the company, through its subsidiary Protiviti Inc., acquired the assets of PG Lewis & Associates, a provider of data forensics and cybersecurity services founded in 2003. The financial terms were not disclosed.
In April 2022, Robert Half moved its legal consulting service line to Protiviti, allowing the subsidiary to expand its legal consulting practice.