Three top white-collar crime lawyers have left their posts at U.S. firms in London after short periods of stay.

Robert Amaee, the white-collar and global investigations head at Quinn Emanuel Urquhart & Sullivan; Louise Delahunty, a partner at Cooley; and David Savell of Locke Lord, have all departed, the firms have confirmed.

Amaee leaves Quinn Emanuel after two and a half years, having joined the litigation powerhouse from Covington & Burling in 2016.

Amaee was previously head of anti-corruption, proceeds of crime and international assistance at the Serious Fraud Office (SFO), and has acted on a number of high-profile bribery and money laundering cases. These include acting for a multinational pharmaceutical company in an SFO whistleblower inquiry. 

It is not yet known what Amaee has gone onto, nor whether he is staying in private practice, but a person with knowledge of the matter said he has been approached by a number of firms.

Quinn London managing partner Richard East said in a statement to Legal Week: "We wish Robert well and success in the future, and thank him for his time with us."

White-collar star Delahunty leaves Cooley after a three-year spell. A LinkedIn profile in her name says she has become a self-employed consultant in the area of business crime and criminal risk compliance.

A boutique-bred lawyer, she spent more than 15 years at financial crime bastion Peters & Peters, following which she had five-year stints at both Simmons & Simmons and US white-shoe firm Sullivan & Cromwell, becoming one of the best-regarded lawyers in her field.

She joined Cooley in 2016, spending most of her tenure as an 'independent consultant', specialising in complex regulatory and litigation matters.

Confirming her departure, a Cooley spokesperson said: "We wish her well."

Meanwhile, Locke Lord partner Savell has also left his firm. Savell, who specialised in financial risk, compliance and regulatory matters, leaves the firm after less than a year, having joined from K&L Gates in March 2018.

A spokeswoman for Locke Lord confirmed that Savell left the firm's London office during the last quarter of 2018, but declined further comment.

Last year, he acted for former Deutsche Bank banker Christian Bittar in the much-publicised Euribor interest rate-rigging scandal.

Two City white-collar crime partners told Legal Week they were not surprised by the departures and said U.S. firms in general operated aggressive billing targets that did not suit everyone.

With reporting by Brenda Sapino Jeffreys, Texas Lawyer