Clifford Chance investigations director Zoe Osborne has left the Magic Circle firm to join U.S. outfit Steptoe & Johnson, according to a person with knowledge of the move.

Osborne had been at CC for 13 years. She was part of the firm’s team that advised oil services company Unaoil in 2016 when it was investigated by the U.K.’s Serious Fraud Office (SFO).