Mack has been selling real estate in the Western Suburbs since 1982. Starting his career with Justin Seward, (now Knight Frank), he was the number one salesperson in his second year at the company and continued as the top salesperson at the firm for the duration of his employment. In 1987 he became a shareholder and Director at Acton Consolidated. During his time at Acton, Mack was the top salesperson at the firm, specialising in high value properties. Mack was also the firm’s leading auctioneer and sold most of the highest priced properties in the state.

In 1994 Mack started his own firm Mack Hall Real Estate. During the last 20+ years he has set many residential sales records (state & national), become state auctioneering champion and represented Western Australia at the Australasian Auctioneering Championships. He has sold more than $3 billion worth of Western Suburbs real estate in his career and has sold the highest priced property in Dalkeith ($39 million). Mack stands alone as the most successful real estate agent in West Australian history.