Alex Clelland, who only joined WS Square Mile last summer, worked as a capital markets journalist before moving into PR.
He worked at Euro Magazine, FX Week and Risk before moving to Reuters, where he was London Treasury correspondent for three years. He then left Reuters to become senior director of corporate comms at Fitch Ratings, before joining WS.
Penrose associate director Sally Todd said Clelland would work in its banking and financial tech team.
Square Mile said it was not immediately replacing him.