This firm emerged from a line of shops that began in the early 1950s as Ferguson & Montgomery and then Cassels Mitchell Somers Dutton & Winkler. The modern firm was established in the early 1980s and currently boasts 48 lawyers. At least four judges including the former chief justice of Ontario Warren Winkler hail from the firm. Dutton Brock LLP has been involved in most major insurance matters — defence and coverage over the last 30 years. The firm focuses on achieving viable solutions to complex insurance litigation issues and includes substantial expertise representing defendants in many major class actions.