George Mackie and his younger brother James (d. 5 January 1851) were London clock and watch makers on Windmill Hill, close to the Foundery. They provided the clocks in many of the London chapels. George joined the Methodist society about 1770 and was a local preacher for 20 years.
About 1776 he joined several others in re-establishing the Christian Community, a society originating with the Huguenots, for visiting the London workhouse and meeting the needs of the poor and sick. Wesley wrote to him, 'I approve of your design; let it be well conducted and it will be much to the glory of God.' He died on 25 October 1821.