Robert McEachern (Mac) Collins was the second son of George Thomas Collins CMG (1839-1926) and his wife Ursula Flora McEachern (1843-1929). Born on 4 Mar 1867, Robert was educated at the Launceston Church Grammar School. He became a solicitor and was admitted to the bar on 25 Aug 1891. He joined the firm of Douglas and Collins, Paterson Street, where he remained for 47 years until his retirement in 1938. For a time he was vice-president of the Northern Law Society.
Robert was a foundation member of the Tamar Yacht Club, holding most offices before becoming the Commodore. He was the Club patron at the time of his death. He played both football and cricket with the Launceston Club in the NTFA and NTCA competitions for some years. Robert was also a president of the Tasmanian Boxing Association, a trustee of the Tamar Rowing Club and a chairman of the Tamar Regatta Association. For many years he was interested in the amateur theatrical movement in Launceston. Several weeks before his death, Robert made his first return flight to Melbourne. He died on 24 Nov 1948 aged 81 and was privately cremated at Carr Villa.