Jack Jeffries is an antitrust and competition lawyer based in London.

Jack advises on a range of UK and EU competition and regulatory matters, including multi-jurisdictional merger control, internal investigations and establishment of joint ventures. While training with the firm, Jack undertook a six-month secondment to BP plc's in-house competition team. Jack trained with the firm and qualified into the practice's antitrust, competition and regulatory group in October 2017.

Jack studied English literature at Cambridge University before completing the GDL and LPC.