1979 marked the establishment of Ezugha Musonda & Company, through the merger of two legal firms - S.S. Ezugha & Co. and Raphael Musonda & Co. Mr William B Nyirenda joined the firm in 1981 and by 1985 had become a Partner. Following the retirement of Mr Ezugha and Mr Musonda, the firm was passed down to Mr William B. Nyirenda SC, who continued to trade under the name Ezugha Musonda & Co. In 2002 the firm underwent a structural overhaul and rebranded itself to William Nyirenda & Company.