The firm operated out of 18 Heriot Row, Edinburgh, concentrating on litigation and latterly adding residential property. Heavily involved in both the Piper Alpha enquiry and the Lockerbie bombing, the firm developed a powerful reputation for its professional approach and strong ethics.
Simpson & Marwick grew its position as the pre-eminent solicitor estate agency in Edinburgh and East Lothian holding onto first place throughout the latter years in terms of value of properties sold.
In 2015 Simpson & Marwick merged with global law firm Clyde & Co. The merger presented insurance company clients access to an even broader service offering and global coverage for those operating overseas. The merged firm was renamed Clyde & Co except for the residential property division which continued to trade under the Simpson & Marwick name. Simpson & Marwick also continued to strengthen its position as the go-to solicitor estate agency in East Scotland.
In October 2020, it was announced that Simpson & Marwick was demerging from Clyde & Co to become part of Moray Legal Ltd.
In August 2023 Simpson & Marwick demerged with Moray Legal Ltd in a move to focus entirely on estate agency operations.
