Wilson-Smith quit his combined editor-in-chief and publishing director post at the financial weekly in February and started work at the seven-strong Quiller on Monday.
He is to concentrate on strategic counsel and crisis management for corporate clients. Quiller also works in public sector and litigation and legal PR.
Wilson-Smith was The Independent’s first financial editor in 1986 before moving to The Independent on Sunday where he worked as business and City editor until 1990.
From 1991 Wilson-Smith worked on the BBC’s Money Programme before co-founding Financial News in 1996, starting on the paper as City editor. He became editor-in-chief in 1998, taking on the role of publishing director from March last year.
William Wright has replaced Wilson-Smith as editor. Jillian Lavender is now publishing director.